* add docs to parachain runtimes * update and add top readme * clarify docs * review plus licenses * Update parachains/README.md * Update parachains/runtimes/assets/README.md Co-authored-by: Bernhard Schuster <bernhard@ahoi.io> * Update parachains/runtimes/assets/README.md Co-authored-by: Bernhard Schuster <bernhard@ahoi.io> Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>