adds README

README.md

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+# MoonTools.Core.Easing
+
+Easing functions for .NET Core
+
+## Reference
+
+https://easings.net
+
+## Example
+
+Use easing functions to transform time values and get fancy animations along paths.
+
+```cs
+using MoonTools.Core.Easing;
+
+// Transform a normalized time value.
+Easing.InQuad(0.75f); // => 0.5625f
+
+// Transform a time value within a time range.
+Easing.InOutSine(3.5, 2, 6); // => 3.2346331352698
+
+// Move within an arbitrary number range based on time.
+Easing.OutQuart(2, 10, 100, 4); // => 103.75
+```
+
+## Additional Info
+
+Use this library with [MoonTools.Core.Curve](https://github.com/MoonsideGames/MoonTools.Core.Curve) for some nicely animated Bezier curves!