Updated README.md file

Detail description about the project.

README.md

@@ -1,16 +1,41 @@
-# url_shortner
-
-# How URL Shortner Works !!
+# URL SHORTNER
 **URL shortner endpoint - returns a short URL**
-1) go run main.go
+It is a service which takes long URL from the user and returns Short URL. 
+
+## How URL Shortner Works !!
+It replaces long URL by randomly generated characters of size 10. 
+It stores both Short and Long URL in the local file, `url.properties`.
+If `url.properties`  file is not present then creates new, otherwise write to the existing ones.
+The advantage of saving Short URL and Long URL in the file is to retrieved that same Short URL correspondiing to Long URL. 
+
+
+## Steps to reproduce it
+1) Clone the repo:
+
+    `git clone https://github.com/viveksahu26/url_shortner.git`
+
+2) Jump to the directory.
+
+    `cd url_shortner`
+
+3) Execute main program. 
 
-2)  
+    `go run main.go`
+
+*NOTE:*: Make sure that Port 8080 is free. For customize port you need to make changes in the codebase.
+
+4)  Go to browser:
+
     Enter your URL after *http://localhost:8080/sort-url?longURL=*
-    And let's say your URL is *http://google.com/1346461234567890123456789/get/vivekkumarsahu*
-    Finally you complete URL will look like:
+
+    And let's say your Long URL: *http://google.com/1346461234567890123456789/get/vivekkumarsahu*
+
+    Finally you complete URL in the browser will look like:
+
     http://localhost:8080/enterLongURL?longURL=http://google.com/1346461234567890123456789/get/vivekkumarsahu
 
 3) You will get output
-```
-{"originalURL":"http://google.com/1346461234567890123456789/get/vivekkumarsahu","shortURL":"http://localhost:8080/RpP^goh8"}
-```
+
+    ```
+    {"originalURL":"http://google.com/1346461234567890123456789/get/vivekkumarsahu","shortURL":"http://localhost:8080/RpP^goh8"}
+    ```