chore: more exemple sounds

examples/assets/sfx/credits.md

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+# Credits
+
+## Mateus Reis
+
+- break.wav (CC-BY-SA 3.0)
+
+- checkpoint.wav (CC-BY-SA 3.0)
+
+- jump.wav (CC-BY-SA 3.0)
+
+- spring.wav (CC-BY-SA 3.0)
+
+## SilverstepP
+
+- shield.wav (GPL)
+
+- acidshield.wav (GPL)
+
+- fireshield.wav (GPL)
+
+- thundershield.wav (GPL)
+
+- watershield.wav (GPL)
+
+- windshield.wav (GPL)
+
+## Alexandre
+
+- spikes_appearing.wav (CC-BY-SA 3.0)
+
+- spikes_disappearing.wav (CC-BY-SA 3.0)
+
+## Supertux
+
+- collectcoin.wav (GPL v2)