Update README.md

Author: devnarendra08

README.md

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-This is the Android MVVM Architecture sample demo app.
+# DemoTMDB
+
+DemoTMDB is the sample app to demonstrate the Android MVVM Architecture with Retrofit, Coroutines, Hilt, Kotlin Flow and Room Database.
+
+[The in-depth details about this sample app can be found at this Medium article.](https://narendrasinhdodiya.medium.com/android-architecture-mvvm-with-coroutines-retrofit-hilt-kotlin-flow-room-48e67ca3b2c8)
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+
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+## Architecture
+![MVVM Architecture](screenshots/mvvm_architecture.png "MVVM Architecture")
+
+
+
+## Screenshots
+|<img src=screenshots/ss_listing.png width = "350"> | <img src=screenshots/ss_detail.png width="350"> |