Add msg to welcome others.
[create-deb] Simple example of how to create deb package

  We can create a simple deb package in create-deb dir.
By run create-deb.sh, it will create atest_0.1-1_amd64.deb. The deb
will install a.sh to /usr/bin, then tape a.sh, will get message: "Hello deb".

  Install deb: sudo dpkg -i atest_0.1-1_amd64.deb
  Remove deb: sudo dpkg -r atest