added changelog and updated readme

Changelog.md

@@ -0,0 +1,12 @@
+# Change Logs
+
+Date: 09-06-2018
+
++ Docker Compose file to deploy in docker
++ Retry logic for Mongoose to retry if database connection drops
++ Boot app only if DB is available
++ Minor spelling correction for variable
+
+Date: 06-06-2018
+
++ Initial Commit

README.md

@@ -30,3 +30,16 @@ module.exports = {
     dbURL: process.env.DATABASEURL || "mongodb://localhost/dropit"
 }
 ```
+
+### :whale: Docker Usage
+
+Preparation:
+
+1. Rename `docker-compose.yml.example` to `docker-compose.yml`
+2. Rename `.env.example` to `.env`
+3. Fill in the missing details in `.env` file
+
+Boot:
+```bash
+docker-compose up -d
+```