added readme

Author: vivekpatel111

README.md

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+# 💰 Simple Wallet Service 💻
+
+![Packagist](https://img.shields.io/packagist/l/doctrine/orm.svg)
+
+Wallet which will allow credit, debit of amount and cancellation of debit/credit transactions and shows current balance.
+
+#### Build project
+```shell
+mvn clean compile assembly:single
+```
+Above command will generate `jar` file with all dependencies.
+
+#### Run project
+Run project directly using `maven` with below command
+```shell
+mvn exec:java
+```
+
+OR
+
+Run project from generated `jar` file using below command
+```shell
+java -cp target/wallet-service-1.0.0-SNAPSHOT-jar-with-dependencies.jar com.wallet.WalletService
+```
+
+*This project is licensed under the terms of the MIT license.*