Create tools.md

Author: iethree

tools.md

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+# Metabase Development Helper Tools
+
+- [Test embedded metabase on a subpath](https://github.com/paoliniluis/metabase-subpath)
+- [Develop Metabase locally on a subpath](https://github.com/iethree/metabase-subpath-proxy)
+- [Metabase standalone SSL](https://github.com/paoliniluis/metabase-standalone-ssl)
+- [Testing cross-domain embedded metabase](https://github.com/JesseSDevaney/embedding-metabase)
+- [Running arbitrary metabase jars on the command line](https://gist.github.com/iethree/157c50a7dbbf2ebd1a6db03c9c1a3968)