add start of commands cheatsheet

docs/manual/development/handycommands.md

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+# Command Cheatsheet
+
+These are some commands that are nice to keep track of:
+
+**give execute permissions to all sh files:**
+`find . -name '*.sh' | xargs git update-index --chmod=+x`
+
+
+**list all used repositories in the catalog:**
+`find . -name 'values.yaml' | xargs cat | grep "repository" | grep -v "{" | awk -F":" '{ print $2 }' | grep -v '^$' | sort --unique`