Adds global.json file for .NET SDK configuration

Adds a global.json file to specify the .NET SDK version and rollForward policy.
This ensures consistent builds and development environments by pinning the SDK version.

Author: Foxlider

FASTER.sln

@@ -12,6 +12,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		azure-pipelines.yml = azure-pipelines.yml
 		.github\workflows\codeql-analysis.yml = .github\workflows\codeql-analysis.yml
 		FASTER_Version.xml = FASTER_Version.xml
+		global.json = global.json
 		NuGet.Config = NuGet.Config
 		.github\workflows\publish.yml = .github\workflows\publish.yml
 		README.md = README.md

global.json

@@ -0,0 +1,6 @@
+{
+    "sdk": {
+        "rollForward": "latestFeature",
+        "version": "9.0.0"
+    }
+}