Add one line desc output for simple_tc

  o Also suggest task_switch.py to try with libbcc package
Signed-off-by: Yonghong Song <yhs@plumgrid.com>

INSTALL.md

@@ -27,6 +27,7 @@ sudo apt-get install libbcc
 
 Test it:
 `sudo python /usr/share/bcc/examples/hello_world.py`
+`sudo python /usr/share/bcc/examples/task_switch.py`
 
 (Optional) Install pyroute2 for additional networking features
 ```bash

examples/simple_tc.py

@@ -5,6 +5,7 @@
 from bpf import BPF
 from pyroute2 import IPRoute
 
+print("Simple program to test pyroute2 IPRoute tc interface")
 ipr = IPRoute()
 
 text = """