add README

README.md

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+## bistu_wifi
+
+This project's target is authorize bistu wifi without open a website and try to simplify the login process with a runnable script which can be easily integrated with autostart mechanism.
+
+This project use only standard library of python3, and no other dependency, so there will be nothing annoying like `No module named XXX`. But also take it in mind that it's `python3`, I don't known if it work with `python2`.
+
+## Install
+
+Open the project directory and run
+
+```
+pip install .
+```
+
+After install, there will be a runnable script `bistu-wifi` at your bin, like `${HOME}/.local/bin` if you install at user level, or `/usr/bin` (or somewhere I don't know) if you install at system level.
+
+## Usage
+
+```
+bistu-wifi --help
+usage: bistu-wifi [-h] [-u [USERNAME]] [-p [PASSWORD]] [--host [HOST]] [-o] [-c [CONFIG]] [--notime]
+
+Login or logout bistu wifi, by sending a post request to authorization host
+
+options:
+  -h, --help            show this help message and exit
+  -u [USERNAME], --username [USERNAME]
+                        username you use to login bistu wifi
+  -p [PASSWORD], --password [PASSWORD]
+                        password you use to login bistu wifi
+  --host [HOST]         host to send login/logout request to, default use 10.1.206.13
+  -o, --logout          logout bistu wifi. try to login if not privided
+  -c [CONFIG], --config [CONFIG]
+                        load info(username, password, host) from config file. Will try /home/leafee98/.config/bistu-wifi/auth.ini if not provided.
+  --notime              don't output time field in log
+
+The format of config file is like below
+
+    [DEFAULT]
+    username = 202000000
+    password = Bistu000000
+    host = 10.1.206.13
+
+```
+
+## Debug
+
+Set the environment `BISTU_WIFI_DEBUG` and the script will print some more log.
+
+```
+export BISTU_WIFI_DEBUG=1
+```
+
+## Develop
+
+Open the project directory and run
+
+```
+pip install --editable .
+```
+
+Then run the script use `bistu-wifi`. Don't use `python -m bistu_wifi` or `python bistu_wifi/__main__.py` because of relative import.
+
+See more at [python setuptools](https://setuptools.pypa.io/en/latest/userguide/quickstart.html#development-mode).
+
+## License
+
+MIT