Add cloud9 for development

.gitignore

@@ -1,3 +1,5 @@
+.c9
+lerna-debug.log
 node_modules
 packages/**/dist
 packages/**/lib

README.md

@@ -41,3 +41,9 @@ These are `npm --global` dependencies:
 # Run Tests
 
 `lerna run test`
+
+# Development
+
+Cloud9 IDE is available via Docker container for development.
+
+`docker-compose up cloud9`

docker-compose.yml

@@ -0,0 +1,12 @@
+version: '2'
+
+services:
+  cloud9:
+    image: sapk/cloud9:latest
+    restart: unless-stopped
+    volumes:
+      - ./:/workspace/
+    ports:
+      - 8080:8080
+      - 8181:8181
+    command: --auth c9:c9