Update README.md

Author: MathavanN

README.md

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-# asp_net_core_api
+# ASP.NET Core Web API development
+We will try to create an api application using asp.net core.
+Maninly using repository pattern, generics, LINQ, Entity framework core
+Main business logic implemented in InMemeory Database (plan to use MSSQL DB)
+ASP NET Identity, JWT Authentication implemented in a separate DB
+Swagger for API Document