[add] Description to README

Add description(installation, how to make scanner and client) to README

Author: akakou

README.md

@@ -1,2 +1,92 @@
 # python-filt
-The libraries for filt.
+## Overview
+Python filt is the packeage for using [Filt](https://github.com/akakou/filt).  
+You can use to make below.
+
+### Filt Client
+Use filt to check whether the target hits the signature.
+
+### Filt Scanner
+Get target and signature, check whether the target hits the signature, and return result to Filt.
+
+## Installation
+Type command below.
+
+```sh
+$ git clone https://github.com/akakou/python-filt
+$ cd python-filt
+$ sudo pip install .
+```
+
+## How to make scanner
+### 1. project directory
+Make the project folder.
+```sh
+$ mkdir sample
+$ cd sample
+```
+
+### 2. `Settings.toml`
+Make `Setting.toml` in project directory
+```Settings.toml
+# this is sample/Settings.toml
+excutable_file = "scanner.py"
+```
+
+### 3. python file
+Make python file and write like below.
+```python
+#!/usr/bin/env python
+"""
+This is sample/scanner.py
+"""
+
+from filt.scanner import BaseScanner 
+
+# **DO NOT use** stdin and stdout.
+# Scanner use them to communicate with filt.
+
+class SampleScanner(BaseScanner):
+    def scan(self, target, signature):
+        """
+        Check target and signature,
+        and return is_hit(bool) and message(str).
+        """
+        # WRITE HERE
+        return (is_hit, message)
+
+if __name__ == '__main__':
+    # run scanner
+    sample_scanner = SampleScanner()
+    sample_scanner.run()
+```
+
+## How to make client
+Make python file and write like below.
+
+```python
+#!/usr/bin/env python
+from filt.client import FiltClient
+
+
+def main():
+    # set param
+    url = 'https://localhost:3000'
+    target = "hello world"
+    option = {"hoge": "fuga"}
+
+    # construct filt client
+    filt = FiltClient(url)
+
+    # send data to filt
+    result = filt.send(target, verify=False)
+    print(result)
+
+    # add option and send data 
+    result = filt.send(target, option=option, verify=False)
+    print(result)
+
+
+if __name__ == '__main__':
+    main()
+```