Add README.md.

Author: jianjunz

README.md

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+# Open WebRTC Toolkit P2P Server
+## Overview
+Open WebRTC Toolkit P2P Server is the default signaling server of Open WebRTC Toolkit. It provides the ability to exchange WebRTC signaling messages over Socket.IO among different clients.
+
+## Running P2P Server
+### Install Dependencies
+Install node dependencies by running following command in root directory of P2P server.
+
+```
+npm install
+```
+
+### SSL/TLS
+The default plain port is 8095, and the default secure port is 8096. These default values can be modified in the file `config.json`.
+
+Connecting server with secure socket.io connections are recommended. The default certificate is stored in `cert` directory with two files: `cert.pem` and `key.pem`. Please replace them with a trusted one applied from a trusted CA.
+
+### Launch the server
+Run the following commands to launch the server:
+
+```
+node peerserver.js
+```
+
+### Stop the server
+Press <kbd>Ctrl</kbd> + <kbd>C</kbd> to stop the peer server.
+
+## How to contribute
+We warmly welcome community contributions to Open WebRTC Toolkit JavaScript SDK repository. If you are willing to contribute your features and ideas to OWT, follow the process below:
+- Make sure your patch will not break anything, including all the build and tests
+- Submit a pull request onto https://github.com/open-webrtc-toolkit/owt-server-p2p/pulls
+- Watch your patch for review comments if any, until it is accepted and merged
+OWT project is licensed under Apache License, Version 2.0. By contributing to the project, you agree to the license and copyright terms therein and release your contributions under these terms.
+
+## How to report issues
+Use the "Issues" tab on Github.
+
+## See Also
+http://webrtc.intel.com