Add Readme

Author: Yepoleb

README.md

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+# Python A2S
+
+Library to query Source and GoldSource servers. Rewrite of the
+[python-valve](https://github.com/serverstf/python-valve) module.
+
+## Requirements
+
+Just Python 3.5+
+
+## Examples
+
+Example output shown may be shortened.
+
+```py
+>>> import a2s
+>>> address = ("stomping.kinofemu.net", 27015)
+>>> a2s.info(address)
+SourceInfo(protocol=17, server_name=" 24/7 Dustbowl :: Nemu's Stomping Ground", map_name='cp_dustbowl',
+folder='tf', game='Team Fortress', app_id=440, player_count=31, max_players=33, bot_count=21,
+server_type='d', platform='l', password_protected=True, vac_enabled=True, version='5579073',
+edf=177, port=27015, steam_id=85568392920040090, stv_port=None, stv_name=None,
+keywords='brutus,celt,couch,cp,dustbowl,increased_maxplayers,nemu,nocrits,nodmgspread,pony,replays,vanilla',
+game_id=440, ping=0.253798684978392)
+>>> a2s.players(address)
+[Player(index=0, name='Brutus', score=34, duration=836.4749145507812),
+ Player(index=0, name='RageQuit', score=6, duration=1080.8099365234375),
+ Player(index=0, name="Screamin' Eagles", score=1, duration=439.8598327636719)]
+>>> a2s.rules(address)
+{'coop': '0', 'deathmatch': '1', 'decalfrequency': '10', 'metamod_version': '1.10.7-devV',
+ 'mp_allowNPCs': '1', 'mp_autocrosshair': '1', 'mp_autoteambalance': '0', 'mp_disable_respawn_times': '0',
+ 'mp_fadetoblack': '0'}
+```
+
+## API
+
+### Functions
+
+* `a2s.info(address, timeout=DEFAULT_TIMEOUT, encoding=DEFAULT_ENCODING)`
+* `a2s.players(address, timeout=DEFAULT_TIMEOUT, encoding=DEFAULT_ENCODING)`
+* `a2s.rules(address, timeout=DEFAULT_TIMEOUT, encoding=DEFAULT_ENCODING)`
+
+### Parameters
+
+* address: `Tuple[str, int]` - Address of the server.
+* timeout: `float` - Timeout in seconds. Default: 3.0
+* encoding: `str` or `None` - String encoding, None disables string decoding. Default: utf-8
+
+### Return Values
+
+* info: SourceInfo or GoldSrcInfo. They are documented in the
+  [source file](a2s/info.py).
+* players: List of Player items. Also documented in the corresponding
+  [source file](a2s/players.py)
+* rules: Dictionary of key - value pairs.
+
+### Exceptions
+
+* `a2s.BrokenMessageError(Exception)` - General decoding error
+* `a2s.BufferExhaustedError(BrokenMessageError)` - Response too short
+* `socket.timeout` - No response
+* `socket.gaierror` - Address resolution error
+
+## License
+
+MIT