feat: add readme

README.md

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+# PDlib - A PHP extension for Dlib
+A PHP extension 
+
+## Requirements
+- Dlib 19.13+
+- PHP 7.0+
+- C++ 11
+
+## Dependence
+
+### Dlib
+
+Install Dlib as share library
+
+```bash
+git clone git@github.com:davisking/dlib.git
+cd dlib/dlib
+mkdir build
+cd build
+cmake ..
+make
+sudo make install
+```
+
+## Installation
+
+```bash
+git clone https://github.com/goodspb/pdlib.git
+cd pdlib
+phpize
+./configure --enable-debug
+make
+sudo make install
+```
+
+## Configure
+
+```
+vim youpath/php.ini
+```
+
+Write the below content into `php.ini`
+
+```
+[pdlib]
+extension="pdlib.so"
+```
+
+## Usage
+
+
+#### face detection
+```php
+<?php
+
+// face detection
+$faceCount = dlib_face_detection("~/a.jpg");
+// how mary face in the picture.
+var_dump($faceCount);
+
+```
+
+#### face landmark detection
+
+```php
+<?php
+
+// face landmark detection
+$landmarks = dlib_face_landmark_detection("~/a.jpg");
+var_dump($landmarks);
+
+```
+
+## Features
+- [x] 1.Face Detection
+- [x] 2.Face Landmark Detection
+- [ ] 3.Deep Face Recognition
+- [ ] 4.Deep Learning Face Detection
+