Add contributing guide

Author: Ellie

CONTRIBUTING.md

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+# Contribution Guide
+
+Hello, thank you for your interest in contributing to this project.
+
+In order to add code to this project using git version control, there are a number of steps to take.
+This guide will focus on these concepts, if you have further questions feel free to make an issues/MR thread,
+join our discord, or ask a mod.
+
+Please join the [OpenRSC discord][discord] and post in the
+`#botting-client-development` channel.
+
+---
+#### Guide for git:
+
+1. Create a fork of the of the Idlersc project
+2. Use git to pull down the master branch from your own remote gitlab repository.
+3. Create a new named branch of master and use that branch to develop changes on.
+   * If Idlersc-master is updated remotely while you are developing changes you will need to rebase before merging.
+   * Go to your fork of Idlersc in a web browser and click the "update fork" button
+   * Pull(fast-forward) down the now updated master branch to your local environment.
+   * Rebase your named dev branch onto the updated local master branch
+   * Push your updated branch to your remote.
+4. When changes are ready to be merged, go to the main Idlersc branch and create a merge request.
+   * Merge requests are under Code category on the left side bar.
+   * The source is your named branch and target is Idlersc-master.
+
+---
+
+If you have any more questions, feel free to ask in the discord (linked above).
+
+Thank you, have a great day!
+
+
+[discord]: https://discord.gg/CutQxDZ8Np