Added some documentation

README.md

+# nodejs tutorial
+
+## Install
+
+### Add respoitory from
+1. Go to https://copr.fedorainfracloud.org/coprs/mvala/hlit/ and download repo file. And save it in /etc/yum.repos.d
+
+2. Install it via yum or dnf
+```
+yum install nodejs npm czmq-devel
+```
+
+## Start sensor (simple broker)
+```
+$ cd cpp-app
+# compile app
+$ gcc -lstdc++ -lczmq -lzmq -o test test.cpp
+# Run app
+$ ./test
+```
+## Start server
+
+```
+npm start
+```
+
+Visit web page at http://localhost:3000