Added more to shell tutorial. Also added a hello world program

W. Trevor King: I dropped everything from the original d25bc30 except
for the 1-Shell/hello addition.

diff --git a/1-Shell/hello b/1-Shell/hello
new file mode 100755 (executable)
index 0000000..cb2ad0f
--- /dev/null
+++ b/1-Shell/hello
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+echo "Hello, World"