Add Flamework installation steps to README (#9)

* Add Flamework installation steps

* Fix typo

* Use jsonc

* Fix spaces instead of tabs

README.md

@@ -9,6 +9,66 @@ Flamework + ECS = Flamecs 🔥
 -   Built-in Scheduler (soon)
 -   Component Metadata (soon)
 
+## Installation
+
+This package is an extension of Flamework and it must be installed and configured. If Flamework is already installed, you can install `@rbxts/flamecs` and skip these steps.
+
+### Install Flamework packages
+
+You can install all the necessary packages using the following command.
+
+```bash
+npm install -D rbxts-transformer-flamework
+npm install @flamework/core
+
+# Install flamecs, if it isn't already
+npm install @rbxts/flamecs
+```
+
+### Configure the transformer
+
+The Flamework transformer must be configured in your `tsconfig.json`. The fields should be placed inside of the `compilerOptions` object.
+
+```jsonc
+{
+	"compilerOptions": {
+		// Add `node_modules/@flamework` into your `typeRoots` field.
+		"typeRoots": ["node_modules/@rbxts", "node_modules/@flamework"],
+
+		// Copy the following fields
+		"experimentalDecorators": true,
+		"plugins": [
+			{
+				"transform": "rbxts-transformer-flamework",
+			},
+		]
+	}
+}
+```
+
+### Configure your Rojo project
+
+Flamework uses a custom npm org and must be configured in your `default.project.json`.
+
+You should find the entry for `node_modules` and modify it to include `@flamework`. It should look something like this:
+
+```json
+"node_modules": {
+	"@rbxts": {
+		"$path": "node_modules/@rbxts"
+	},
+	"@flamework": {
+		"$path": "node_modules/@flamework"
+	}
+}
+```
+
+### Recompile
+
+You may need to delete the `out` folder and recompile for Flamework's transformer to begin working. Afterwards, you are ready to use flamecs.
+
+## Demo
+
 ```ts
 const positionEntity = spawn<[Vector3]>([new Vector3(10, 20, 30)]);
 print(has<Vector3>(positionEntity));