system/picocom: Added (minimal dumb-terminal emulation)

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diff --git a/system/picocom/README b/system/picocom/README
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+picocom is a minimal dumb-terminal emulation program.  It is, in principle,
+very much like minicom, only it's pico instead of mini!
+
+Picocom was designed to serve as a simple, manual, modem configuration,
+testing, and debugging tool.  It has also served (quite well) as a low-tech
+"terminal-window" to allow operator
+ intervention in PPP connection scripts (something like the ms-windows
+ "open terminal window before / after dialing" feature).
+It could also prove useful in many other similar tasks.
+
+Picocom is ideal for embedded systems since its memory footprint is minimal
+(less than 20K, when stripped).
+
+Apart from being a handy little tool, picocom source distribution includes
+a simple, easy to use, and thoroughly documented
+ terminal-management library, which could serve other projects as well.
+This library hides the termios(3) calls, and provides a less complex and
+safer (though certainly less feature-rich) interface.
+
+Picocom runs on Linux, and with minor modifications it could run on any
+Unix system with the termios(3) library.