docs: Added CONTRIBUTING.md (#70)

CONTRIBUTING.md

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+## Notes about Formatting
+Gboard requires a very specific format for shortcut files to work.
+
+![format](https://user-images.githubusercontent.com/20955511/95510460-a153ec00-09be-11eb-8400-4aca07484973.png)
+
+Each line of the file containing a shortcut must have: the shortcut (ex. `\sum`), a single tab (` `), the symbol (ex. `∑`), and another a single tab (` `) at the end of the line.
+
+**Note**: Some editors automatically convert tabs to spaces, you can try to avoid this by copy-pasting the tabs from a different line to ensure the spacing is correct.
+
+## Shortcut guidelines
+Shortcuts must be the same as the command from LaTeX or resemble the LaTeX shortcuts. If typing the symbol is complex in LaTeX, a shorter shortcut may be used as long as it is in the style of LaTeX commands.
+
+It is at the discretion of the project maintainer to decide whether a certain shortcut should be accepted or not.
+
+## Setup
+* Fork the Repository.
+* Clone it to the local machine. This can be done either by using `git clone https://github.com/<your_github_username>/LaTeX-Gboard-Dictionary.git` or directly by using github desktop.
+* Open the folder on VS Code.
+
+## Issues
+* Choose an issue to work on from [Issues](https://github.com/DenverCoder1/LaTeX-Gboard-Dictionary/issues) and claim that issue.
+* After the issue is assigned to you, start working on it. 
+
+## Making changes locally
+* While making new changes to this repo make sure to **create a new branch** everytime.
+* Make the changes that are needed.
+* Save them.
+* Use `git add .` command in terminal.
+* Then use `git commit -m "Enter a message that tells about the changes you made"` in terminal.
+
+## Pull Request
+* Add upstream as the main repository using `git remote add upstream https://github.com/DenverCoder1/LaTeX-Gboard-Dictionary.git` command in terminal.
+* Push changes to origin i.e. your forked repository by using `git push origin master`.
+* Before making pull request whether your forked repository is updated. For this use `git pull upstream master` command in the terminal.
+* Make sure to test the file after making changes by making a compressed folder (zip) containing the txt file in a folder.
+* Create a pull request with relevant heading. 
+* Add supporting screenshots to establish the areas you have worked on.
+* The repository maintainers will review your pull request and accordingly merge it or request changes.