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environment setup

+# installation of node js and react
+
+step :1  sudo apt-get install curl    // package locator
+step :2 curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -     // source setup
+step :3 sudo apt-get install -y nodejs  // installation of node js
+step :4 node -v                                    // To check the version for node js
+step :5 sudo apt install npm                // installation of node package maanager
+step :6  npm -v                                    // To check the version for npm
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