add contributing instructions

README.md

@@ -9,7 +9,7 @@ Tesseract.js is a pure javascript version of the Tesseract OCR Engine that can r
 # Installation
 Tesseract.js works with a `<script>` tag via local copy or cdn, or with `npm` (if you're using webpack / browserify).
 
-## `<script/>`
+## Script Tag
 
 ### CDN
 
@@ -43,7 +43,35 @@ worker.recognize('#my-image')
 ```
 
 
-## npm 
+## npm
+###TODO
+
+<!-- ```shell
+> npm install tesseract-js ?
+```-->
+
+# Contributing
+## Development
+To run a development copy of tesseract.js, first clone this repo.
+```shell
+> git clone https://github.com/naptha/tesseract.js.git
+```
+
+Then, cd in to the folder, `npm install`, and `npm start`
 ```shell
-npm install tesseract
-```
+> cd tesseract.js
+> npm install && npm start
+  ... a bunch of npm stuff ... 
+  tesseract.js@1.0.0 start /Users/guillermo/Desktop/code_static/tesseract.js
+  node devServer.js
+
+Listening at http://localhost:7355
+```
+
+Then open `http://localhost:7355` in your favorite browser. The devServer automatically rebuilds tesseract.js and tesseract.worker.js when you change files in the src folder.
+
+## Building Static Files
+After you've cloned the repo and run `npm install` as described in the [Development Section](#development), you can build static library files in the dist folder with 
+```shell
+> npm run build
+```