publish initial release of Entity-Relationship Diagram (ERD)

ERD/README.md

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+# PostgSail ERD
+The Entity-Relationship Diagram (ERD) provides a graphical representation of database tables, columns, and inter-relationships. ERD can give sufficient information for the database administrator to follow when developing and maintaining the database.
+
+## A global overview
+![API Schem](https://github.com/xbgmsharp/postgsail/ERD/postgsail.pgerd.png "API Schema")
+
+## Further
+There is 3 main schemas:
+- API Schema ERD
+    - tables
+      - metrics
+      - logbook
+      - ...
+    - functions
+      - ...
+![API Schem](https://github.com/xbgmsharp/postgsail/ERD/ERD_schema_api.png "API Schema")
+
+- Auth Schema ERD
+  - tables
+    - accounts
+    - vessels
+    - ...
+  - functions
+    - ...
+![Auth Schema](https://github.com/xbgmsharp/postgsail/ERD/ERD_schema_auth.png "Auth Schema")
+
+- Public Schema ERD
+  - tables
+    - app_settings
+    - tpl_messages
+    - ...
+  - functions
+    - ...
+![Public Schema](https://github.com/xbgmsharp/postgsail/ERD/ERD_schema_public.png "Public Schema")
+