Added example custom easing function.

Author: PhilJay

MPChartExample/src/com/xxmassdeveloper/mpchartexample/custom/MyEasingFunction.java

@@ -0,0 +1,20 @@
+
+package com.xxmassdeveloper.mpchartexample.custom;
+
+import com.github.mikephil.charting.animation.AnimationEasing.EasingFunction;
+
+/**
+ * Example of a custom made animation EasingFunction.
+ * 
+ * @author Philipp Jahoda
+ */
+public class MyEasingFunction implements EasingFunction {
+
+    @Override
+    public float ease(long elapsed, long duration) {
+
+        // do awesome stuff here, this is just linear easing
+        return elapsed / (float) duration;
+    }
+
+}