Create README.md

Author: dkgupta2501

README.md

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+# Send SMS Android SDK
+_Integrate android sdk to Send SMS from Mobtexting_
+## __Getting Started__
+### Gradle
+**Step 1.** Add the JitPack repository to your build file
+```
+allprojects {
+  repositories {
+    maven { url 'https://jitpack.io' }
+  }
+}
+```
+**Step 2.** Add the dependency  
+```
+dependencies {
+  implementation 'com.github.mobtexting:mobtexting-android:v1.0'
+}
+```
+#### define _API KEY_ and _Sender_ ID in Manifest file inside Application tag
+```
+  <meta-data android:name="mobtexting.api_key" android:value="@string/mobtextingapikey" />
+  <meta-data android:name="mobtexting.sender_id" android:value="@string/mobtextingsenderid" />
+```
+#### Usage
+
+```
+public class MainActivity extends AppCompatActivity implements MobtextingInterface{
+    private Mobtexting mobtexting;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        
+        //create instance of Mobtexting class
+        mobtexting=new Mobtexting(this);
+        
+        //send the SMS
+        mobtexting.sendSMS("This is a test","7488792140",this);
+    }
+
+    @Override
+    public void onResponse(ServerResponse serverResponse) {
+        Log.d("response",serverResponse.getStatus()+"  "+serverResponse.getDescription()+"  "+serverResponse.getSmsId());
+    }
+
+    @Override
+    public void onError(ModelError modelError) {
+        Log.d("response",modelError.getStatus()+"  "+modelError.getDescription());
+    }
+}
+```