read me update

README.md

@@ -43,14 +43,17 @@ DB Name: chat
 collections: 
 1. users :- collection that store primary information of user i.e mobile, country code and and name
  eg- 
+
  {
  "_id":"5d710302e85bdf72bf3ac110", 
  "mobile":1111111111, 
  "countryCode":"+91", 
  "name":"Name01" 
  }
+
 2. contacts:- added contact will be store in this collection, a room will be assigned to both users.
  eg-
+
  {
  "_id":"5d7131acc643910edf2308ee",
  "mobile":1111111111,
@@ -59,6 +62,7 @@ collections:
  "room":"22222222221111111111"
  }
 3. chatMessage: message will be strored in this collection. query can be made by distinct room name and all the messages are stored in a array as given below.
+
  {
  "_id":"5d7215c096fab91104edeff4",
  "room":"44444444443333333333",