#369 Add CLI options and commands list to readme file. (#478)

readme.md

@@ -30,12 +30,39 @@ npm i -g @zeit/ncc
 
 ### Usage
 
+```bash
+$ ncc <cmd> <opts>
+```
+Eg: 
 ```bash
 $ ncc build input.js -o dist
 ```
 
 Outputs the Node.js compact build of `input.js` into `dist/index.js`.
 
+
+#### Commands:
+```
+  build <input-file> [opts]
+  run <input-file> [opts]
+  cache clean|dir|size
+  help
+  version
+```
+
+#### Options:
+```
+  -o, --out [file]         Output directory for build (defaults to dist)
+  -m, --minify             Minify output
+  -C, --no-cache           Skip build cache population
+  -s, --source-map         Generate source map
+  --no-source-map-register Skip source-map-register source map support
+  -e, --external [mod]     Skip bundling 'mod'. Can be used many times
+  -q, --quiet              Disable build summaries / non-error outputs
+  -w, --watch              Start a watched build
+  --v8-cache               Emit a build using the v8 compile cache
+```
+
 ### Execution Testing
 
 For testing and debugging, a file can be built into a temporary directory and executed with full source maps support with the command: