Update index.md [Sample applications table]

Providing entry to dockerize .Net Core application from the left navigation panel into the "Sample applications" table

Author: shubhamsre

samples/index.md

@@ -39,6 +39,7 @@ Run popular software using Docker.
 | Sample | Description |
 | ------ | ----------- |
 | [apt-cacher-ng](/engine/examples/apt-cacher-ng) | Run a Dockerized apt-cacher-ng instance. |
+| [.Net Core application](/engine/examples/dotnetcore) | Run a Dockerized ASP.NET Core application. |
 | [ASP.NET Core + SQL Server on Linux](/compose/aspnet-mssql-compose) | Run a Dockerized ASP.NET Core + SQL Server environment. |
 | [CouchDB](/engine/examples/couchdb_data_volumes) | Run a Dockerized CouchDB instance. |
 | [Django + PostgreSQL](/compose/django/) | Run a Dockerized Django + PostgreSQL environment. |