Update README.md

.gitignore

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+.idea/
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+.html/
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+env27/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# dotenv
+.env
+
+# virtualenv
+.venv
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+/tests/data.sqlite
+/examples/toapi-pic/data.sqlite

README.md

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 ![PyPI](https://img.shields.io/pypi/v/expire.svg)
 
-Expire aims to make using cache as convenient as possible.
+## What is Expire
+
+When you are writing a service, maybe you need to be able to save a piece of JSON data to your system's memory.
+
+Expire aims to make using cache as convenient as possible.
+
+There are three ways to create a cache, which are MemoryCache, RedisCache or MemcachedCache.
+
+## How to Use?
+
+### Installation
+
+**Run:**
+
+``` shell
+pip install expire
+
+pip install git+https://github.com/howie6879/expire.git
+```
+
+### Usage
+
+**MemoryCache:** easy to configure, but it automatically destroys when the server is stopped.
+
+``` python
+from expire import CacheSetting, MemoryCache
+
+memory_cache = MemoryCache()
+memory_cache.set('name', 'expire')
+cache_ins = CacheSetting()
+print(cache_ins.get('name'))
+
+# Output: expire
+```
+
+**RedisCache:** stable but you have to install Redis.
+
+``` python
+from expire import Settings
+from expire import RedisCache, cached, CacheSetting
+
+class MySettings(Settings):
+    """
+    Create custom configuration
+    """
+    cache = {
+        # RedisCache, MemoryCache or MemcachedCache
+        'cache_class': RedisCache,
+        'cache_config': {
+            'host': '127.0.0.1',
+            'port': 6379,
+            'db': 0,
+            'password': None
+        },
+        # JsonSerializer, PickleSerializer or StrSerializer
+        'serializer': None
+    }
+@cached(**MySettings.cache, ttl=1000)
+def parse(url, params=None, **kwargs):
+    return "{0}: {1}".format(url, 'hello')
+
+
+def cached_by_redis(key):
+    cache_ins = CacheSetting(MySettings)
+    return cache_ins.get(key)
+
+key = 'expire'
+result = parse(url=key, dynamic_key=key)
+print(result)
+# Output 'expire: hello'
+print(cached_by_redis(key))
+# Output 'expire: hello'
+```