Add README.md

README.md

+# HOWTO
+
+- `./studip-docker init
+- `./studip-docker keys:create`
+- `./studip-docker site:add main <path-to-studip> public`
+- `./studip-docker compile -bsF`
+
+- Open https://localhost/sites in your browser
+
+Please note:
+
+Database is still external
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