Create README.md

Author: Pythonista7

README.md

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+# ComputerNetworksLab VTU 17 Scheme
+ A best effort service to comment code and learn about this lab.
+
+## Installation Guide for NS2(Ubuntu)
+ 1. Install network simulator 
+ `$sudo apt install ns2`
+ 
+ 2. Download xgraph from http://www.xgraph.org/linux/index.html for appropriate Ubuntu on your machine.
+ 3. Untar the downloaded file :
+    `$sudo tar -C /bin/xgraph/ -xvf xgraph_4.38_linux64.tar.gz `
+   <br><br> NOTE:  This untared dir has a bin dir which contains the xgraph executable which we need to add to .bashrc 
+4. Navigate to home using directory and open .bashrc file
+5. Create Alias for the command , add the below line into bashrc file
+	`alias xgraph='path_to_the_untarred_dir/bin/xgraph' `
+7. Run the below command to reflect changes made to bashrc :<br>
+    `$ source ~/.bashrc`
+6. Have fun with tcl.`