added README.md

Author: samburtonlaurie

README.md

@@ -0,0 +1,10 @@
+### To run the demo
+
+```bash
+$ npm install -g serverless # skip this line if you have already installed Serverless Framework
+$ export AWS_REGION=ap-northeast-1 # You can specify region or skip this line. eu-west-2 will be used by default.
+$ mvn compile dependency:copy-dependencies -DincludeScope=runtime
+$ docker build --tag docker-selenium-lambda-kotlin .
+$ sls deploy
+$ sls invoke --function demo # Yay! You will get texts of example.com
+```