Create _sidebar.md

Author: waqasm78

docs2/pages/getting-started/_sidebar.md

@@ -0,0 +1,6 @@
+- [Overview](overview.md)
+- [Licensing](licensing.md)
+- Tutorials
+   - [Arithmetic Expressions](arithmetic-expressions.md)
+   - [Split Text](split-text.md)
+   - [Reqular Expressions](regular-expressions.md)