first program added

computer_networks/simulation/.gitignore

@@ -1,6 +1,6 @@
 # ignore everything
-*
+/*
 
 # dont ingnore these
 !.gitignore
-!scratch
+!scratch/

computer_networks/simulation/scratch/hello_network.cc

@@ -0,0 +1,19 @@
+/**
+ * /mnt/z/my_git/sixth-semester/computer_networks/simulation/practice/hello_network.cc
+ * @author Avinal Kumar
+ * @since February 02, 2021
+ *
+ * Network Simulation Hello World
+ */
+
+#include "ns3/core-module.h"
+
+NS_LOG_COMPONENT_DEFINE("HelloNetwork");
+
+int main(int argc, char const *argv[])
+{
+    NS_LOG_UNCOND("Hello Network");
+
+    ns3::Simulator::Run();
+    ns3::Simulator::Destroy();
+}