添加安卓端基本功能

android/esptouch/README.md

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+# EspTouch
+[example](../app/src/main/java/com/espressif/esptouch/android/v1)
+
+- Create task instance
+  ```java
+  Context context; // Set Applicatioin context
+  byte[] apSsid = {}; // Set AP's SSID
+  byte[] apBssid = {}; // Set AP's BSSID
+  byte[] apPassword = {}; // Set AP's password
+
+  EsptouchTask task = new EsptouchTask(apSsid, apBssid, apPassword, context);
+  task.setPackageBroadcast(true); // if true send broadcast packets, else send multicast packets
+  ```
+
+- Set result callback
+  ```java
+  task.setEsptouchListener(new IEsptouchListener() {
+      @Override
+      public void onEsptouchResultAdded(IEsptouchResult result) {
+          // Result callback
+      }
+  });
+  ```
+
+- Execute task
+  ```java
+  int expectResultCount = 1;
+  List<IEsptouchResult> results = task.executeForResults(expectResultCount);
+  IEsptouchResult first = results.get(0);
+  if (first.isCancelled()) {
+    // User cancel the task
+    return;
+  }
+  if (first.isSuc()) {
+    // EspTouch successfully
+  }
+  ```
+
+- Cancel task
+  ```java
+  task.interrupt();
+  ```