Add snowball and egg impact sounds

mods/ITEMS/mcl_throwing/README.md

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+# `mcl_throwing`
+
+It's a MineClone 2 mod containing throwable items like snowballs.
+
+## License of code
+
+- MIT License
+
+## License of media
+
+- `mcl_throwing_snowball_impact_soft.ogg`:
+    - License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
+    - Author: YleArkisto (freesound.org)
+    - Source: <https://freesound.org/people/YleArkisto/sounds/258144/>
+    - Original title: `sfx_snowball_hit-03.wav` (file was edited)
+- `mcl_throwing_snowball_impact_hard.ogg`:
+    - License: CC0
+    - Author: Julien Matthey (freesound.org)
+    - Source: <https://freesound.org/people/Julien%20Matthey/sounds/167080/>
+    - Original title: `JM_IMPACT_01c - Snow on cement.wav` (file was edited)
+- `mcl_throwing_egg_impact.ogg`:
+    - License: CC0
+    - Author: dav0r (freesound.org)
+    - Source: <https://freesound.org/people/dav0r/sounds/176760/>
+    - Original title: `d0_step_on_egg_04` (file was edited)
+- Everything else: See MineClone 2 license infos