Add README.md

Author: batprat

README.md

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+# gitonbrowser
+
+**gitonbrowser** is a Git client on your web browser. Internally it is an express application that executes git commands behind the scenes and provides UI on any browser.
+One big advantage of **gitonbrowser** is that since it runs in a browser, it will provide (almost) the same experience on different OSs when used in the same browser.
+
+## Requirements
+nodejs (https://nodejs.org)
+
+## Installation
+1. clone or download the repository anywhere on your computer.
+2. `cd` into the folder where you have cloned/downloaded the repository.  You should be inside the folder with the `package.json` file.
+3. `npm install`
+4. `npm start`
+5. Open http://localhost:3000 in the browser of your choice.
+
+To use another port (e.g. 4001), `npm start 4001`.
+
+## Common Errors
+One common error at this point might be that the node app **doesn't have write access** to your git files. In this case, **open an elevated command prompt / terminal app** and try the above steps.