Added documents directory and install_node.md

docs/install_node.md

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+# Installing node.js, npm and socket.io to CentOS
+
+0. pre install needed module
+
+install followings packages if they have not been insalled yet
+```
+# yum install openssl-devel
+# yum install python
+# yum install gcc-c++
+```
+
+1. install node.js & npm
+
+```
+$ wget http://nodejs.org/dist/v0.6.19/node-v0.6.19.tar.gz // latest url
+$ tar xzvf node-v0.6.19.tar.gz // download file
+$ cd node-v0.6.19
+$ ./configure
+$ make
+$ sudo make install
+```
+
+2. install socket.io
+
+error occured
+```
+[ws v0.4.19] Attempting to compile blazing fast native extensions.
+[ws v0.4.19] Native code compile failed (but the module will still work):
+[ws v0.4.19] The native extensions are faster, but not required.
+[ws v0.4.19] On Windows, native extensions require Visual Studio and Python.
+[ws v0.4.19] On Unix, native extensions require Python, make and a C++ compiler.
+[ws v0.4.19] Start npm with --ws:verbose to show compilation output (if any).
+```
+http://stackoverflow.com/questions/11089082/installing-socket-io-with-node-js-v0-6-18-ws-failes-during-install
+
+success when installing to sekico.co server
+```
+[ws v0.4.19] Attempting to compile blazing fast native extensions.
+[ws v0.4.19] Native extension compilation successful!
+```