Create erd.md

Author: alextanhongpin

erd.md

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+Add `schemaspy.properties`:
+
+
+```
+# type of database. Run with -dbhelp for details
+schemaspy.t=pgsql
+# optional path to alternative jdbc drivers.
+#schemaspy.dp=path/to/drivers
+# database properties: host, port number, name user, password
+schemaspy.host=host.docker.internal
+schemaspy.port=5432
+schemaspy.db=development
+schemaspy.u=john
+schemaspy.p=123456
+# output dir to save generated files
+# schemaspy.o=path/to/output
+# db scheme for which generate diagrams
+schemaspy.s=public
+```
+
+```make
+schemaspy:
+	docker run -v "$(shell pwd)/schemaspy:/output" -v "$(shell pwd)/schemaspy.properties:/schemaspy.properties" schemaspy/schemaspy:snapshot
+```