WIP, incomplete keystroke tables (#70)

* WIP, incomplete keystroke tables

* Update Keystrokes.md

Fix typo and improve formatting a bit

Signed-off-by: Andrew Sengul <a@imagegardenphoto.com>

* leave breadcrumbs if this has been moved

* This Using.html has been superceded by other changes

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Signed-off-by: Andrew Sengul <a@imagegardenphoto.com>
Co-authored-by: Andrew Sengul <a@imagegardenphoto.com>

Author: masinter

content/en/software/using-medley/keystrokes.md

@@ -0,0 +1,39 @@
+---
+title: Keystrokes, Mouse menus and Gestures
+url: /software/using-medley/keystrokes/
+weight: 40
+aliases:
+ - /doc/info/Keystrokes.html
+---
+
+The handling of keyboard and mouse clicks and gestures is different and varied within the Medley environment. This chart shows common keystrokes.
+[Table of Keystrokes](https://docs.google.com/spreadsheets/d/1FOkrr62TtEhhY49m9U0T_6bvqSGRQt9fBRtMDw0YKtY/edit?usp=sharing) more data.
+
+We'd like to improve keyboard handling but haven't yet found a path.
+
+## At an "exec" (i.e., the REPL). 
+
+|character |action                          |
+|----------|--------------------------------|
+|backspace | delete the previous character  |
+|ctrl-H    |   (same as backspace)          |
+|enter     |if at end of line, terminate    |
+|ctrl-M    |  (same as enter)               |
+|ctrl-alt-J|move down                       |
+|ctrl-alt-L|move to start of line           |
+|ctrl-alt-Y|"get userexec" ????             |
+
+## Interrupt characters
+
+These are enabled per-process. Medley maintains, for each process, a "termtable" which enables different kinds of interrupts. In general, the process (sometimes known as the "TTY" process or the process that "has the keyboard". 
+
+|character|action                                                |
+|---------|-----------------------------------------             |
+|ctrl-B   |stop the process and enter a break window             |
+|ctrl-D   | reset the process, unwind the stack to the top level |
+|ctrl-E   | unwind the stack as if an error occured without break|
+|ctrl-P   | interrupt printing and reset the PRINTLEVEL          |
+
+
+
+