Support >>bot.README first call to open gateway live script

Also: handle case of batch mode (e.g. for testing)

Author: vijayiyer05

+bot/+internal/README.mlx

@@ -0,0 +1,8 @@
+% For BOT users: view gateway live script in interactive MATLAB
+% For BOT testers: run gateway live script in batch MATLAB mode
+
+if batchStartupOptionUsed
+    bot.internal.README(); 
+else
+    edit bot.internal.README;
+end