Update usage in README

README.md

@@ -1,14 +1,40 @@
 # ng2-translate-extract
 Extract strings from projects using ng2-translate to json or pot files.
 
-## Install
-1. `git clone https://github.com/biesbjerg/ng2-translate-extract.git`
-2. `cd ng2-translate-extract`
-3. `npm install`
-
-## Try it out
-1. Run `npm run watch` in a separate terminal
-2. Edit `src/test.ts` to your likings
-3. `node dist/test.js` to run it
-
 **THIS IS STILL VERY MUCH A WORK IN PROGRESS**
+
+## Usage
+If you only need to extract strings from one project, you can install the package locally:
+
+`npm install ng2-translate-extract --save-dev`
+
+Add the following `extract` script your project's `package.json`:
+```
+"scripts": {
+  "extract": "ng2-translate-extract --dir ./src --output ./ --format=json"
+}
+```
+You can now run `npm run extract` to extract strings from your project's `src` dir. The extracted strings are saved in `JSON`-format in your project's root.
+
+Modify the scripts arguments as required. 
+
+## Global install
+You can also install the package globally:
+
+`npm install ng2-translate-extract -g`
+
+Now you can execute the script from everywhere:
+
+`ng2-translate-extract --dir /extract/from/this/dir --output /save/to/this/dir --format pot`
+## Commandline arguments
+```
+Usage:
+  ng2-translate-extract [OPTIONS] [ARGS]
+
+Options:
+  -d, --dir [DIR]        Directory path you would like to extract strings from  (Default is /Users/kim/ionic/ng2-translate-extract/bin)
+  -o, --output [DIR]     Directory path you would like to save extracted
+                         strings  (Default is /Users/kim/ionic/ng2-translate-extract/bin)
+  -f, --format [VALUE]   Output format. VALUE must be either [json|pot]  (Default is json)
+  -h, --help             Display help and usage details
+```