Add a CONTRIBUTING file

diff --git a/.pkgmeta b/.pkgmeta
index 162fc0b..414c413 100644
--- a/.pkgmeta
+++ b/.pkgmeta
@@ -3,3 +3,6 @@ package-as: BonusRollPreview
 manual-changelog:
     filename: CHANGELOG.md
     markup-type: markdown
+
+ignore:
+    - CONTRIBUTING.md
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..9b771d3
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,32 @@
+## Issues
+
+If you have an issue with the addon and you'd like to report it, please follow these steps:
+
+- Make sure you've got a GitHub account, you can sign up [here](https://github.com/join).
+- Make sure it's this addon causing the issue by running it alone to verify.
+	- If there is a compatibility issue, please report that too.
+- Please describe the issue as best you can, and include as many details as you can.
+- Some details are required:
+	- What version are you using? (don't say "latest" or "newest").
+	- Can you reproduce it, and if you can, how?
+	- If there was an error message, include it.
+	- If it is a graphical issue, include a screenshot (use [imgur](https://imgur.com/) or something).
+- Make sure you check back often until the issue is resolved for any follow-up questions.
+
+You can report issues by clicking the "Issues" button on the right of by following [this link](https://github.com/p3lim-wow/BonusRollPreview/issues).
+
+## Contributing
+
+If you would like to contribute with a feature, bug fix or any other sort of improvement, please follow the steps below.
+Since I am using git for this project, it is required that you know how to use it to contribute.
+
+- Make sure you've got a GitHub account, you can sign up [here](https://github.com/join).
+- [Fork](https://github.com/p3lim-wow/BonusRollPreview/fork) the project, this gives you a copy of the addon's source files on your account.
+- Clone your copy of the project and make a new branch.
+- Make your changes, and make sure you test them **thoroughly!**
+- Before you commit your changes, make sure to follow some simple code style guidelines:
+	- Use tabs, not spaces.
+	- Don't leave andy trailing whitespace.
+- Commit your changes with a short but descriptive description of what the changes do, then push to GitHub.
+- File a [pull request](https://github.com/p3lim-wow/BonusRollPreview/compare).
+- Make sure you check back often until the changes are merged for any follow-up questions.