readme updated

README.md

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+# CenterSeekbar
+Custom seekbar that start from the center 
+
+public class MainActivity extends AppCompatActivity {
+
+    private CenterPointSeekBar seekBar;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        seekBar=findViewById(R.id.seekbar);
+        seekBar.setProgress(3);
+        seekBar.setOnSeekBarChangeListener(new CenterPointSeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onOnSeekBarValueChange(CenterPointSeekBar bar, double value) {
+
+            }
+        });
+
+    }
+}