Create README.md

Author: uschwinn

data-platform/core-converged-db/database-23c/sql-domains/README.md

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+# SQL DOMAINS
+
+A SQL domain (also called usage domain or domain) is a dictionary object that belongs to a schema and encapsulates a set of optional properties and constraints for common values. After you define a SQL domain, you can define table columns to be associated with that domain, 
+thereby explicitly applying the domain's optional properties and constraints to those columns. SQL domains are used to provide additional information to a stored column (JSON or relational), and therefore, used to define and validate data.
+Oracle's SQL domain implementation provides a wider range of functions than the one specified in the SQL standard (see Part 2 Foundation (SQL Foundation)).
+ 
+
+## Useful Links
+
+### Documentation
+
+- [SQL Language Reference 23c](https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/create-domain.html#GUID-17D3A9C6-D993-4E94-BF6B-CACA56581F41)
+- [Database Development Guide](https://docs.oracle.com/en/database/oracle/oracle-database/23/adfns/registering-application-data-usage-database.html#GUID-6F630041-B7AE-4183-9F97-E54682CA6319)
+
+
+### Team Publications
+
+- [Less coding using new SQL Domains in 23c](https://blogs.oracle.com/coretec/post/less-coding-with-sql-domains-in-23c)
+- [Oracle Database 23c Free Developer Release - 10 features you should know](https://blogs.oracle.com/coretec/post/oracle-database-23c-free-developer-sql)
+
+
+### LiveLabs Workshops
+
+- [coming soon]
+
+
+# License
+
+Copyright (c) 2023 Oracle and/or its affiliates.
+
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See LICENSE for more details.