Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to theme.park
+
+## New theme option
+
+* The current variables in use can be found in any of the CSS files in `/CSS/variables/`
+* New community contributed theme options will be placed in the `Community Themes` category on our docs page.
+* Community themes are not officially supported but as long as they follow the same variable structure as the other theme options it should look fine on all applications. 
+* When contributing a new option, you must have example screeenshots of the theme being used. Preferrably at least 10 with the same image size. See examples on our [docs page](https://docs.theme-park.dev/community-themes/).
+
+### Specials
+
+Remember to also to change the variables in the the `Specials` section even if you dont use the application the variable refers to.
+* `--arr-queue-color` Please refrain from using an orange/yellowish color on the variable as its confusing from a UX standpoint as the "arrs" use that color range when something is wrong in the queue.  
+
+## New application theme
+
+* When creating a new theme for an application please test multiple theme options to make sure it looks good on all options not just your favorite.
+* The PR must contain a screenshot of all the different theme options. Optionally you can also include screenshots with the community theme options.
+
+## Bug fixes
+
+* When submitting bugfixes please show a before and after screenshot of the fix, and a description of what the fix does.