commit 23764f282d2bead503da5e5935af144280aa1fad
Author: Glenn Y. Rolland <glenux@glenux.net>
Date:   Sun May 17 17:08:31 2020 +0200

    Add README

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+# Rakenne
+
+(means _structure_ in Finish)
+
+Rakenne is a database modeling tool.
+
+Its goal is:
+
+* to provide a DSL for modeling database
+  * to describe entity-relationship diagrams (ERD) using MERISE notation
+  * to describe physical diagrams (PD)
+* to provide a command-line tool for all operations
+* to render models into diagrams
+  * ERD to MERISE MCD diagrams
+  * ERD to Chen notation diagrams
+  * PD to MERISE MLD diagrams
+* to validate model
+* to convert across different database reprentations
+  * to convert ERD to PD
+  * to convert PD to database specific SQL
+  * to reverse-engineer database-specific SQL to PD
+  * to reverse-engineer PD to ERD
+* to support multiple physical models
+  * sql
+  * nosql
+* to support multiple SQL and NoSQL languages
+  * SQL: postgresql
+  * SQL: mariadb
+  * NoSQL: redis
+  * NoSQL: mongodb
+  * NoSQL: cassandra CQL
+
+
+## References
+
+* https://en.wikipedia.org/wiki/Entity%E2%80%93relationship_model
+* https://www.lucidchart.com/pages/er-diagrams
+* https://www.youtube.com/watch?v=LR0Ip5Jenbk