Adds travis to build

.travis.yml

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+language: csharp
+mono: none
+dotnet: 2.2.6
+solution: ASS.API.sln
+script:
+ - dotnet restore

ASS.API.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29123.88
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ASS.API", "ASS.API.csproj", "{2686709C-7803-4E0E-B426-F0BDBE47D5A2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2686709C-7803-4E0E-B426-F0BDBE47D5A2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2686709C-7803-4E0E-B426-F0BDBE47D5A2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2686709C-7803-4E0E-B426-F0BDBE47D5A2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2686709C-7803-4E0E-B426-F0BDBE47D5A2}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8124BD9C-012D-4955-9E60-DA17ACB4162D}
+	EndGlobalSection
+EndGlobal