Add missing files and README instructions

Author: raphink

.dockerignore

@@ -0,0 +1,2 @@
+Dockerfile
+Dockerfile.dev

README.md

@@ -1,2 +1,17 @@
-# terraboard
+# Terraboard
+
 Web Dashboard to inspect Terraform States
+
+
+## Using with Docker
+
+```shell
+$ docker run -d -p 80:80 \
+   -e AWS_REGION=<AWS_DEFAULT_REGION> \
+   -e AWS_ACCESS_KEY_ID=<AWS_ACCESS_KEY_ID> \
+   -e AWS_SECRET_ACCESS_KEY=<AWS_SECRET_ACCESS_KEY> \
+   -e AWS_BUCKET=<terraform-bucket> \
+   camptocamp/terraboard:latest
+```
+
+and point your browser to http://localhost