add more documentation

website/src/contributing/code-of-conduct.md

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+# Code of Conduct

website/src/contributing/design-guidelines.md

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+# Design Guidelines
+

website/src/contributing/plugins.md

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-# Contributing Plugins
+# Contributing Plugins
+
+If you wish to contribute plugins and have them accepted into the official repository then your plugin has to:
+- fulfill the code layout requirements given by the linter config
+- follow the libreevent [design guidelines](&/contributing/design-guidelines)
+- conform to our [code of conduct](&/contributing/code-of-conduct)
+- not contain any immediately obvious flaws (as layed out in the code of conduct), be it in terms of security or reliability
+- provide all necessary files for libreevent
+- offer settings if possible and necessary and a way to graphically edit them
+- have extensive documentation on its usage. Once accepted into the official repos, the documentation will be added to the official documentation.