High-level documentation for the shell library

libraries/Terminal/examples/SerialShell/SerialShell.ino

@@ -6,10 +6,10 @@ This example is placed into the public domain.
 
 #include <Shell.h>
 
-int ledPin = 13;
-
 Shell shell;
 
+int ledPin = 13;
+
 void cmdLed(Shell &shell, int argc, const ShellArguments &argv)
 {
     if (argc > 1 && !strcmp(argv[1], "on"))

libraries/Terminal/keywords.txt

@@ -0,0 +1,4 @@
+Shell	KEYWORD1
+LoginShell	KEYWORD1
+Terminal	KEYWORD1
+loop	KEYWORD2