[repo] Move OpenTelemetry.SemanticConventions project from main repo

opentelemetry-dotnet-contrib.sln

@@ -1,4 +1,4 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.0.31912.275
 MinimumVisualStudioVersion = 15.0.26124.0
@@ -347,6 +347,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.ResourceDetec
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenTelemetry.PersistentStorage.Abstractions.Tests", "test\OpenTelemetry.PersistentStorage.Abstractions.Tests\OpenTelemetry.PersistentStorage.Abstractions.Tests.csproj", "{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenTelemetry.SemanticConventions", "src\OpenTelemetry.SemanticConventions\OpenTelemetry.SemanticConventions.csproj", "{BC1959E3-164E-42AE-AE1C-DE2E3046E27C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -693,6 +695,10 @@ Global
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BC1959E3-164E-42AE-AE1C-DE2E3046E27C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BC1959E3-164E-42AE-AE1C-DE2E3046E27C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BC1959E3-164E-42AE-AE1C-DE2E3046E27C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BC1959E3-164E-42AE-AE1C-DE2E3046E27C}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -796,6 +802,7 @@ Global
 		{033CA8D4-1529-413A-B244-07958D5F9A48} = {22DF5DC0-1290-4E83-A9D8-6BB7DE3B3E63}
 		{36271347-2055-438E-9659-B71542A17A73} = {2097345F-4DD3-477D-BC54-A922F9B2B402}
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E} = {2097345F-4DD3-477D-BC54-A922F9B2B402}
+		{BC1959E3-164E-42AE-AE1C-DE2E3046E27C} = {22DF5DC0-1290-4E83-A9D8-6BB7DE3B3E63}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {B0816796-CDB3-47D7-8C3C-946434DE3B66}

src/OpenTelemetry.SemanticConventions/CHANGELOG.md

@@ -0,0 +1,9 @@
+# Changelog
+
+## Unreleased
+
+* Updated to `1.25.0` release of OpenTelemetry Semantic Conventions.
+  ([#1672](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/1672))
+
+* Moved from `https://github.com/open-telemetry/opentelemetry-dotnet/` to
+  `https://github.com/open-telemetry/opentelemetry-dotnet-contrib/`.

src/OpenTelemetry.SemanticConventions/OpenTelemetry.SemanticConventions.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <Description>OpenTelemetry Semantic Conventions</Description>
+    <PackageTags>$(PackageTags);semantic-conventions</PackageTags>
+    <MinVerTagPrefix>SemanticConventions-</MinVerTagPrefix>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+</Project>

src/OpenTelemetry.SemanticConventions/README.md

@@ -0,0 +1,34 @@
+# Semantic Conventions for OpenTelemetry .NET
+
+This project contains the generated code for the [Semantic Conventions](https://github.com/open-telemetry/semantic-conventions)
+defined by the OpenTelemetry specification.
+
+## Installation
+
+```shell
+dotnet add package OpenTelemetry.SemanticConventions --prerelease
+```
+
+## Generating the files
+
+This project uses the
+[Semantic Convention Generator](https://github.com/open-telemetry/build-tools/blob/main/semantic-conventions/README.md).
+The folder `scripts` at the top level of the project contains the template
+and the script files used in the process.
+
+To generate the code files, run:
+
+```shell
+./scripts/generate.sh
+```
+
+Or, with PowerShell:
+
+```shell
+./scripts/generate.ps1
+```
+
+## References
+
+* [OpenTelemetry Project](https://opentelemetry.io/)
+* [Build tools](https://github.com/open-telemetry/build-tools)