Update README.md

Author: potterhsu

README.md

@@ -1,2 +1,74 @@
 # RtspLibrary
 Android library based on FFMpeg for playing given RTSP endpoint.
+
+## Pipeline
+Open RTSP Endpoint --> Find Video Stream --> Read Frame --> Convert to RGB --> Invoke Callback --> Java Interface
+|                                                                                             |
+|_____________________________________ JNI + FFMpeg __________________________________________|
+
+## Setup
+1.  In root build.gradle:
+  ```
+  allprojects {
+    repositories {
+      ...
+      maven { url 'https://jitpack.io' }
+    }
+  }
+  ````
+
+2.  In target module build.gradle
+  ```
+  dependencies {
+    compile 'com.github.potterhsu:RtspLibrary:1.0'
+  }
+  ```
+
+## Usage
+
+1. Initialize
+  ```java
+  ImageView ivPreview = (ImageView) findViewById(R.id.ivPreview);
+  RtspClient rtspClient = new RtspClient(new NativeCallback() {
+      @Override
+      public void onFrame(final byte[] frame, final int nChannel, final int width, final int height) {
+          ivPreview.post(new Runnable() {
+              @Override
+              public void run() {
+                  int area = width * height;
+                  int pixels[] = new int[area];
+                  for (int i = 0; i < area; i++) {
+                      int r = frame[3 * i];
+                      int g = frame[3 * i + 1];
+                      int b = frame[3 * i + 2];
+                      if (r < 0) r += 255;
+                      if (g < 0) g += 255;
+                      if (b < 0) b += 255;
+                      pixels[i] = Color.rgb(r, g, b);
+                  }
+                  Bitmap bmp = Bitmap.createBitmap(pixels, width, height, Bitmap.Config.ARGB_8888);
+                  ivPreview.setImageBitmap(bmp);
+              }
+          });
+      }
+  });
+  ```
+
+2. Play
+  ```java
+  new Thread(new Runnable() {
+      @Override
+      public void run() {
+          rtspClient.play("");
+      }
+  }).start();
+  ```
+
+3. Stop and release
+  ```java
+  rtspClient.stop();
+  rtspClient.dispose();
+  ```
+
+## Demo
+Clone the repository and run.