started endpoints to manage random challenge

BeReadyBackend/Endpoints/RandomChallenges/GenerateRandomChallengeEndpoint.cs

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+namespace BeReadyBackend.Endpoints.RandomChallenges;
+
+public class GenerateRandomChallengeEndpoint
+{
+    
+}

BeReadyBackend/Endpoints/RandomChallenges/GetRandomChallengeEndpoint.cs

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+namespace BeReadyBackend.Endpoints.RandomChallenges;
+
+public class GetRandomChallengeEndpoint
+{
+    
+}

BeReadyBackend/Endpoints/RandomChallenges/PatchProofEndpoint.cs

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+namespace BeReadyBackend.Endpoints.RandomChallenges;
+
+public class PatchProofEndpoint
+{
+}