Add abstract interface for SQL databases

Change-Id: I72072dd1056a071b48fb54ba8ff844d21ed86011

io.murano.databases.SqlDatabase/Classes/SqlDatabase.yaml

@@ -0,0 +1,36 @@
+Namespaces:
+  =: io.murano.databases
+  std: io.murano
+
+Name: SqlDatabase
+
+Extends:
+  - std:Application
+
+Methods:
+
+  createDatabase:
+    Arguments:
+      - database:
+          Contract: $.string().notNull()
+
+  createUser:
+    Arguments:
+      - username:
+          Contract: $.string().notNull()
+      - password:
+          Contract: $.string().notNull()
+
+  assignUser:
+    Arguments:
+      - username:
+          Contract: $.string().notNull()
+      - database:
+          Contract: $.string().notNull()
+
+  getConnectionString:
+    Arguments:
+      - username:
+          Contract: $.string().notNull()
+      - password:
+          Contract: $.string().notNull()

io.murano.databases.SqlDatabase/manifest.yaml

@@ -0,0 +1,10 @@
+Format: 1.0
+Type: Library
+FullName: io.murano.databases
+Name: SQL Library
+Description: |
+ This is the interface defining API for different SQL - RDBMS databases
+Author: 'Mirantis, Inc'
+Tags: [SQL, RDBMS]
+Classes:
+ io.murano.databases.SqlDatabase: SqlDatabase.yaml