Add dependencies status badge

Author: kolomied

README.md

@@ -1,5 +1,6 @@
 # aws-cdk-sqlserver-seeder
 ![build](https://github.com/kolomied/cdk-sqlserver-seeder/workflows/build/badge.svg)
+[![dependencies](https://david-dm.org/kolomied/cdk-sqlserver-seeder.svg)](https://david-dm.org//kolomied/cdk-sqlserver-seeder)
 
 A simple CDK seeder for SQL Server