docs: Add readme (#13)

* docs: add readme

* docs: add readme

README.md

@@ -1,3 +1,38 @@
 # etcd-watcher
 
-About Etcd watcher for PyCasbin.
+[![tests](https://github.com/pycasbin/etcd-watcher/actions/workflows/release.yml/badge.svg)](https://github.com/pycasbin/etcd-watcher/actions/workflows/release.yml)[![Coverage Status](https://coveralls.io/repos/github/pycasbin/etcd-watcher/badge.svg)](https://coveralls.io/github/pycasbin/etcd-watcher)[![Version](https://img.shields.io/pypi/v/casbin-etcd-watcher.svg)](https://pypi.org/project/casbin-etcd-watcher/)[![Download](https://img.shields.io/pypi/dm/casbin-etcd-watcher.svg)](https://pypi.org/project/casbin-etcd-watcher/)[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/casbin/lobby)
+
+Etcd Watcher is the [Etcd](https://github.com/coreos/etcd) watcher for [pycasbin](https://github.com/casbin/pycasbin). With this library, Casbin can synchronize the policy with the database in multiple enforcer instances.
+
+## Installation
+
+    pip install casbin-etcd-watcher
+
+## Simple Example
+
+```python
+import casbin
+from etcd_watcher import new_watcher
+
+def update_callback_func(event):
+    ...
+
+watcher = new_watcher(endpoints=["localhost", 2379], keyname="/casbin")
+watcher.set_update_callback(update_callback_func)
+
+e = casbin.Enforcer(
+	get_examples("rbac_model.conf"), get_examples("rbac_policy.csv")
+)
+
+e.set_watcher(watcher)
+# update_callback_func will be called
+e.save_policy()
+```
+
+## Getting Help
+
+- [Casbin](https://github.com/casbin/pycasbin)
+
+## License
+
+This project is under Apache 2.0 License. See the [LICENSE](LICENSE) file for the full license text.

setup.py

@@ -18,7 +18,7 @@
     readme = readme_file.read()
 
 setup(
-    name="casbin_etcd_watcher",
+    name="casbin-etcd-watcher",
     author="nekotoxin",
     author_email="nekotoxin@gmail.com",
     description="Casbin role watcher to be used for monitoring updates to policies for PyCasbin",