Added simple draft manual page for grgsm_livemon in rst format.
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+=============
+grgsm_livemon
+=============
+
+-------------------------------------------------------
+GSM C0 monitor forwarding packages to network interface
+-------------------------------------------------------
+
+:Author: Piotr Krysik - ptrkrysik@gmail.com
+:Date: 2017-08-21
+:Copyright: public domain
+:Version: 0.0
+:Manual section: 1
+:Manual group: User Commands
+
+SYNOPSIS
+========
+
+grgsm_livemon [options]
+
+DESCRIPTION
+===========
+
+Interactive monitor of a single C0 channel with analysis performed by
+Wireshark. Example command to run wireshark:
+
+ sudo wireshark -k -f udp -Y gsmtap -i lo
+
+
+OPTIONS
+=======
+
+-h, --help
+ show this help message and exit
+
+--args=ARGS
+ Set Device Arguments [default=]
+
+-g GAIN, --gain=GAIN
+ Set gain [default=30]
+
+--osr=OSR
+ Set OverSampling Ratio [default=4]
+
+-p PPM, --ppm=PPM
+ Set ppm [default=0]
+
+-s SAMP_RATE, --samp-rate=SAMP_RATE
+ Set samp_rate [default=2M]
+
+-o SHIFTOFF, --shiftoff=SHIFTOFF
+ Set Frequency Shiftoff [default=400k]
+
+-f FC, --fc=FC
+ Set GSM channel's central frequency [default=941.8M]
+
+SEE ALSO
+========
+
+* `<https://github.com/ptrkrysik/gr-gsm/>`__
+* ``grgsm_scanner(1)``