Full refactor and update to .NET 9 now can be a client library

.gitignore

@@ -350,3 +350,5 @@ MigrationBackup/
 
 # Ionide (cross platform F# VS Code tools) working folder
 .ionide/
+# User-specific configuration
+appsettings.json

BtcMarkets.sln

@@ -0,0 +1,30 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BtcMarkets.Client", "src\BtcMarkets.Client\BtcMarkets.Client.csproj", "{A1B2C3D4-E5F6-7890-A1B2-C3D4E5F67890}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BtcMarkets.ConsoleSample", "src\BtcMarkets.ConsoleSample\BtcMarkets.ConsoleSample.csproj", "{B2C3D4E5-F6A7-8901-B2C3-D4E5F6A78901}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BtcMarkets.Client.Tests", "tests\BtcMarkets.Client.Tests\BtcMarkets.Client.Tests.csproj", "{C3D4E5F6-A7B8-9012-C3D4-E5F6A7B89012}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A1B2C3D4-E5F6-7890-A1B2-C3D4E5F67890}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A1B2C3D4-E5F6-7890-A1B2-C3D4E5F67890}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A1B2C3D4-E5F6-7890-A1B2-C3D4E5F67890}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A1B2C3D4-E5F6-7890-A1B2-C3D4E5F67890}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B2C3D4E5-F6A7-8901-B2C3-D4E5F6A78901}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B2C3D4E5-F6A7-8901-B2C3-D4E5F6A78901}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B2C3D4E5-F6A7-8901-B2C3-D4E5F6A78901}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B2C3D4E5-F6A7-8901-B2C3-D4E5F6A78901}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C3D4E5F6-A7B8-9012-C3D4-E5F6A7B89012}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C3D4E5F6-A7B8-9012-C3D4-E5F6A7B89012}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C3D4E5F6-A7B8-9012-C3D4-E5F6A7B89012}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C3D4E5F6-A7B8-9012-C3D4-E5F6A7B89012}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal