Adding README.md and executable jar

Author: sonamko

README.md

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+# Money transfer Rest API
+
+A Java RESTful API for money transfers between users accounts
+
+### Technologies
+- JAX-RS API
+- As an in memory database static Concurrent Hashmap used
+- Jetty Container 
+- Grizzly server for Test
+
+### How to run
+``` Executable jar at path : executableJar/
+
+     java -jar moneytransfer-1.0   {Will start the server, the api can then be hit using Postman}
+```
+
+#### Implementation Design
+Application starts a jetty server on localhost port 8080 . An in memory database (currently concurrent Hashmap) initialized with some sample user and account data To view
+
+- http://localhost:8080/userAccount/1
+- http://localhost:8080/userAccount/2
+
+-Basic validations to prompt the user in case the request is not proper. For eg, when user does not have sufficient balance
+
+-Junit Testcases to user account service and transaction service.
+
+
+### Available Services
+
+
+	| HTTP METHOD |       PATH            | USAGE  |
+	| ----------- | --------------------- | ------ |
+	| GET         | /userAccount/{userId} | get userAccount by user Id | 
+	| GET         | /userAccount/         | get all userAccounts |
+	| POST        | /userAccount/         | create a new userAccount | 
+	| PUT         | /userAccount/{userId} | update userAccount | 
+	| DELETE      | /userAccount/{userId} | remove userAccount | 
+	| POST        | /transaction/withdraw | withdraw money from account | 
+	| POST        | /transaction/deposit  | deposit money to account | 
+	| POST        | /transaction/transfer | perform transfer between 2 user accounts | 
+
+### Http Status
+- 200 OK: The request has succeeded
+- 201 Created: The request has been created .
+- 400 Bad Request: The request could not be understood by the server 
+- 404 Not Found: The requested resource cannot be found
+- 500 Internal Server Error: The server encountered an unexpected condition 
+
+### Sample JSON for User and Account
+##### User : 
+```sh
+{
+	"userName" : "Test",
+	"balance" : "100"
+	}
+```
+##### User Transaction: 
+
+```sh
+{  
+   "fromUserId": "2",
+	 "toUserId": "1",
+	"amount": "100"
+} 
+```
+#### Current Limitations:
+- Static Hashmap can be replaced by in memory database like H2
+- Validations can be enhanced.