feat: Implement database schema, relationships and models for survey application

- Designed an ERD (Entity-Relationship Diagram) for the survey system.
- Defined entities: User, Survey, Question, Choice, Response, and Answer.
- Established relationships:
  - Users can author multiple surveys.
  - Surveys contain multiple questions.
  - Questions have multiple choices.
  - Surveys can have multiple responses from participants.
  - Responses are linked to answers, questions, and choices.
- Ensured compliance with best practices for relational database design.
Note : no migration yet

survey-beta.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
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+MinimumVisualStudioVersion = 10.0.40219.1
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+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7A5087A4-5EFE-49C8-AD7A-A2AC9F815C32}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7A5087A4-5EFE-49C8-AD7A-A2AC9F815C32}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7A5087A4-5EFE-49C8-AD7A-A2AC9F815C32}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7A5087A4-5EFE-49C8-AD7A-A2AC9F815C32}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AD3F914F-11E0-46E6-A86F-6C7743255DC4}
+	EndGlobalSection
+EndGlobal