update basic description of the moban page

Users/Moban.rst

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+What is Moban?
+====================
+
+Description
+-----------------
+
+Moban is an open source general purpose static text generator , which can use
+other python template engine: mako, handlebars, velocity, haml, slim and
+tornado, can read other data format: json and yaml, and can access both template
+file and configuration file in any location: zip, git, pypi package, s3, etc.
+It is used in coala project to keep documentation consistent across the
+documentations of individual libraries in the same organisation. You can find
+more documentation on `MobanDocumentation https://moban.readthedocs.io/en/latest/`__
+
+Install ``moban``:
+
+::
+
+ $ pip install moban
+
+CLI arguments:
+
+::
+
+ moban [-h] [-c CONFIGURATION] [-t TEMPLATE] [-o OUTPUT] [-td [TEMPLATE_DIR [TEMPLATE_DIR ...]]]
+ [-cd CONFIGURATION_DIR] [-m MOBANFILE] [-g GROUP] [--template-type TEMPLATE_TYPE]
+ [-d DEFINE [DEFINE ...]] [-e EXTENSION [EXTENSION ...]] [-f][--exit-code]
+ [-V] [-v][template]
+
+Sample usage:
+
+::
+
+ mohan -c [input file(JSON, YAML)] -t [template file] -o [outputfile]