epptouch sdk更新，闪退修改强化

Ifish/ESPTouch/README.md

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+# EspTouch
+
+## Example
+- [example](../UI/V1/)
+
+## APIs
+- Create task instance
+  ```Objective-C
+  ESPTouchTask *task = [[ESPTouchTask alloc] initWithApSsid:apSsid andApBssid:apBssid andApPwd:apPwd];
+  [task setEsptouchDelegate:delegate]; // Set result callback
+  [Task setPackageBroadcast:YES]; // if YES send broadcast packets, else send multicast packets
+  ```
+
+- Execute task
+  ```Objective-C
+  int expectCount = 1;
+  NSArray * results = [task executeForResults:expectCount];
+  ESPTouchResult *first = [results objectAtIndex:0];
+  if (first.isCancelled) {
+      // User cancel the task
+      return;
+  }
+  if (first.isSuc) {
+      // EspTouch successfully
+  }
+  ```
+
+- Cancel task
+  ```Objective-C
+  [task interrupt];
+  ```