Added governance.

GOVERNANCE.md

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+# Governance
+
+Anyone can send pull request to https://github.com/wekan/wekan/wiki/pulls ,
+if there is permission to add code to WeKan with MIT license.
+
+As maintainer, xet7 checks all pull requests and merges them.
+
+Only xet7 has write access to repo https://github.com/wekan/wekan
+
+