Update README.md

Author: kelvinst

README.md

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 # circleci_elixir
-Our version of elixir container for circle ci
+
+Teamweek's Circle CI Docker Image for Elixir
+
+## Intro
+
+- Circle CI's Elixir + Node docker image. (circleci/elixir:1.6)
+- wkhtmltopdf
+- libs for deploy
+
+## Build
+
+`docker build -t teamweek/circleci_elixir:latest .`
+
+## Docker Hub
+
+[https://hub.docker.com/r/teamweek/circleci_elixir/](https://hub.docker.com/r/teamweek/circleci_elixir/)