Add user guide

User guide does not exist.

A user guide will provide convenient usage information to users and
warn them of improper usage.

Let's
* Add a detailed user guide with command summary, features, introduction
and quick start.

docs/README.md

@@ -1,30 +1,174 @@
 # Banter User Guide
 
-// Update the title above to match the actual product name
+![Screenshot of a comment on a GitHub issue showing an image, added in the Markdown, of an Octocat smiling 
+and raising a tentacle.](./Ui.png)
 
-// Product screenshot goes here
+Banter is an **app for managing tasks**, optimized for use via a **Command Line Interface (CLI)**, while still having 
+the benefits of a **chat-bot Graphical User Interface (GUI)**. If you can type fast, Banter can get your tasks 
+management done faster than traditional GUI apps.
 
-// Product intro goes here
+---------------------------------------
 
-## Adding deadlines
+## Quick start
 
-// Describe the action and its outcome.
+1. Ensure you have Java `11` or above installed in your Computer.
+2. Download the latest `banter.jar`
+3. Copy the file to the folder you want to use as the home folder for Banter.
+4. Open a command terminal, `cd` into the folder you put the jar file in, and use the `java -jar addressbook.jar` 
+command to run the application. A GUI similar to the below should appear in a few seconds.
+![Screenshot of the Banter GUI](./Start.png)
+5. Type the command in the command box and press Enter to execute it. e.g. typing `help` and pressing Enter will
+6. Refer to the [Features](#features) below for details of each command.
 
-// Give examples of usage
+---------------------------------------
 
-Example: `keyword (optional arguments)`
+## Command summary
 
-// A description of the expected outcome goes here
+| Action                          | Format, Examples                                                                                                                         |
+|---------------------------------|------------------------------------------------------------------------------------------------------------------------------------------|
+| Add todo                        | `todo <description>` <br> e.g. `todo read book`                                                                                          |
+| Add deadline                    | `deadline <description> /by <date>` <br> e.g. `deadline return book /by 1/12/2024`                                                       |
+| Add event                       | `event <description> /from <start date> /to <end date>` <br> e.g. `event project <br/>meeting /from 12/12/2024 0900 /to 12/12/2024 1800` |
+| List all tasks                  | `list`                                                                                                                                   |
+| Mark as done                    | `mark <task number>` <br> e.g. `mark 1`                                                                                                  |
+| Unmark as not done              | `unmark <task number>` <br> e.g. `unmark 1`                                                                                              |
+| Find matching tasks by keywords | `find <keyword>` <br> e.g. `find meeting project`                                                                                        |
+| Delete task                     | `delete <task number>` <br> e.g. `delete 1`                                                                                              |
 
+---------------------------------------
+
+## Features
+
+> [!NOTE]
+> **Notes about the command format:**
+> * The following date time formats are supported:
+>   * `d/M/yyyy HHmm` (e.g. 1/12/2024 1800)
+>   * `d/M/yyyy` (e.g. 1/12/2024)
+>   * `dd/MM/yyyy HHmm` (e.g. 01/12/2024 1800)
+>   * `dd/MM/yyyy` (e.g. 01/12/2024)
+> * Words in `<angle brackets>` are the parameters to be supplied by the user.
+> * Parameters must be in the order specified.
+> * Extraneous parameters for commands that do not take in parameters (such as list) will be ignored.
+
+### Adding todos
+
+Adds a todo to the task list. Todos are tasks that need to be done, but do not have a deadline.
+
+Format: `todo <description>`
+
+Example: `todo read book`
+
+Expected outcome:
+```
+Got it. I've added this task:
+[T][ ] read book
+Now you have 1 tasks in the list.
+```
+
+### Adding deadlines
+
+Adds a deadline to the task list. Deadlines are tasks that need to be done by a certain date.
+
+Format: `deadline <description> /by <date>`
+
+Example: `deadline return book /by 1/12/2024`
+
+Expected outcome:
+```
+Got it. I've added this task:
+[D][ ] return book (by: 1/12/2024)
+Now you have 2 tasks in the list.
+```
+
+### Adding events
+
+Adds an event to the task list. Events are tasks that start and end at a certain time.
+
+Format: `event <description> /from <start date> /to <end date>`
+
+Example: `event project meeting /from 12/12/2024 0900 /to 12/12/2024 1800`
+
+Expected outcome:
+```
+Got it. I've added this task:
+[E][ ] project meeting (from: 12/12/2024 0900 to: 12/12/2024 1800)
+Now you have 3 tasks in the list.
+```
+
+### Deleting tasks
+
+Deletes a task from the task list.
+
+Format: `delete <task number>`
+
+Example: `delete 1`
+
+Expected outcome:
+```
+Noted. I've removed this task:
+[T][ ] read book
+Now you have 2 tasks in the list.
+```
+
+### List all tasks
+
+Shows a list of all tasks in the task list.
+
+Format: `list`
+
+Example: `list`
+
+Expected outcome:
+```
+Here are the tasks in your list:
+1. [D][ ] return book (by: 1/12/2024)
+2. [E][ ] project meeting (from: 12/12/2024 0900 to: 12/12/2024 1800)
+3. [T][ ] read book
+```
+
+### Mark as done
+
+Marks a task as done.
+
+Format: `mark <task number>`
+
+Example: `mark 1`
+
+Expected outcome:
 ```
-expected output
+Nice! I've marked this task as done:
+[D][X] return book (by: 1/12/2024)
 ```
 
-## Feature ABC
+### Unmark as not done
+
+Unmarks a task as done.
 
-// Feature details
+Format: `unmark <task number>`
 
+Example: `unmark 1`
+
+Expected outcome:
+```
+Nice! I've unmarked this task as not done:
+[D][ ] return book (by: 1/12/2024)
+```
 
-## Feature XYZ
+### Find matching tasks by keywords
+
+Finds tasks that match the given keywords. The search is case-insensitive. Keywords can be ordered in any way.
+
+Format: `find <keyword>`
+
+Example: `find meeting project`
+
+Expected outcome:
+```
+Here are the matching tasks in your list:
+1. [E][ ] project meeting (from: 12/12/2024 0900 to: 12/12/2024 1800)
+```
 
-// Feature details
+> [!CAUTION]
+> **Caution about editing stored data file:**
+> Do not edit the data file `tasklist.txt` manually. If you do, Banter may not be able to read the file, 
+> and you may lose your data or crash the program.