Update README.md

README.md

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 # Android-BackgroundChart
+
+![screenshot](https://github.com/JastAir/Android-BackgroundChart/raw/master/%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%202019-03-08%20%D0%B2%2019.32.03.png)
+
+It's are simple chart for background your activity or fragment. You can choose colors with gradient for display your chart the most customize or choose what kind you chart need is now, simple lines or bezier.
+Best it usage and good luck ;)
+
+
+# How use
+
+    <com.fdev.backgroundchart.GradientChart  
+      android:id="@+id/gradientChart"  
+      android:layout_width="0dp"  
+      android:layout_height="0dp"  
+      app:layout_constraintBottom_toBottomOf="parent"  
+      app:layout_constraintEnd_toEndOf="parent"  
+      app:layout_constraintStart_toStartOf="parent"  
+      app:layout_constraintTop_toTopOf="parent"  
+      app:plusColorStart="#2196F3"  
+      app:plusColorEnd="#90CAF9"  
+      app:minusColorStart="#90CAF9"  
+      app:minusColorEnd="#90CAF9"  
+      app:zoom="10"  
+      app:isBezier="true"/>
+      
+**And for appent your data just write for example** 
+
+    gradientChart.chartValues = arrayOf(  
+      10f, 30f, 25f, 32f, 13f, 5f, 18f, 36f, 20f, 30f, 28f, 27f, 29f  
+    )