molecule: add page (#3223)

pages/common/molecule.md

@@ -0,0 +1,24 @@
+# molecule
+
+> Molecule helps testing ansible roles.
+> More information: <https://molecule.readthedocs.io>.
+
+- Create a new ansible role:
+
+`molecule init role --role-name {{role_name}}`
+
+- Run tests:
+
+`molecule test`
+
+- Start the instance:
+
+`molecule create`
+
+- Configure the instance:
+
+`molecule converge`
+
+- Login into the instance:
+
+`molecule login`