Add st-util man page

doc/man/.gitignore

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+*.1

doc/man/Makefile

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+MAN1 =
+MAN1 += st-util.md
+
+all: $(patsubst %.md, %.1, $(MAN1))
+
+%.1: %.md
+	pandoc -s -t man $< -o $@
+	tail --line=+3 $@ > tmp && mv tmp $@
+
+clean:
+	rm *.1

doc/man/st-util.md

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+% ST-UTIL(1) Open Source STMicroelectronics Stlink Tools  | STLINK
+%
+% Sep 2016
+
+
+# NAME
+st-util - Run GDB server to interact with STM32 device
+
+
+# SYNOPSIS
+*st-util* \[\<ARGS>...]
+
+
+# DESCRIPTION
+Start a GDB server to interact with a STM32 device
+Run the main binary of the local package (src/main.rs).
+
+If a port number is not specified using the **--listen_port** option, the
+default **4242** port will be used.
+
+Stlink version 2 is used by default unless the option **--stlinkv1** is given.
+
+The STLINKv2 device to use can be specified in the environment
+variable STLINK_DEVICE on the format <USB_BUS>:<USB_ADDR>.
+
+
+# OPTIONS
+
+-h, --help
+:   Print this message.
+
+-v *XX*, --verbose=XX
+:   Specify a specific verbosity level (0..99)
+
+-v, --verbose
+:   Specify generally verbose logging
+
+-s *X*, --stlink_version=X
+:   Choose what version of stlink to use, (defaults to 2)
+
+-1, --stlinkv1
+:   Force stlink version 1
+
+-p *4242*, --listen_port=1234
+:   Set the gdb server listen port. (default port: 4242)
+
+-m, --multi
+:   Set gdb server to extended mode. st-util will continue listening for connections after disconnect.
+
+-n, --no-reset
+:   Do not reset board on connection.
+
+
+# EXAMPLES
+Run GDB server on port 4500 and connect to it
+
+    $ st-util -p 4500
+    $ gdb
+    (gdb) target extended-remote localhost:4500
+
+
+# SEE ALSO
+st-flash(1), st-info(1), st-term(1)
+
+
+# COPYRIGHT
+This work is copyrighted. Stlink contributors.
+See *LICENSE* file in the stlink source distribution.