Added Third Party Notices.md doc (#1519)

NEW: Added "Third Party Notices.md" document with license for Rebinding UI sample.

Author: ekcoh

Assets/Samples/RebindingUI/README.md

@@ -4,4 +4,5 @@ This sample demonstrates how to use the Input System APIs to set up a rebinding
 
  Finally, the [RebindSaveLoad](./RebindSaveLoad.cs) script demonstrates how to persist user rebinds in `PlayerPrefs` and how to restore them from there.
 
- The icons used in the sample are taken from [Free Prompts Pack](https://opengameart.org/content/free-keyboard-and-controllers-prompts-pack) made by Nicolae Berbece.
+ The icons used in the sample are taken from [Free Prompts Pack v4.0](https://opengameart.org/content/free-keyboard-and-controllers-prompts-pack) created by, and made available to public domain by Nicolae Berbece.
+ Icons are licensed under [Creative Commons CC0](https://creativecommons.org/publicdomain/zero/1.0/).

Third Party Notices.md

@@ -0,0 +1,134 @@
+# This package contains third-party software components governed by the license(s) indicated below
+
+---
+
+<pre>
+Component Name: Assets/Samples/RebindingUI/Icons/*.png (RebindingUI sample icon assets)
+Source URL:     https://opengameart.org/content/free-keyboard-and-controllers-prompts-pack
+Version:        4.0
+License:        Creative Commons CC0
+License URL:    https://creativecommons.org/publicdomain/zero/1.0/
+
+
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
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+Statement of Purpose
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+</pre>