Basic devcontainer (#907)

* Basic devcontainer

* Update devcontainer.json

Author: vncoelho

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/dotnet
+{
+	"name": "C# (.NET)",
+	"image": "mcr.microsoft.com/devcontainers/dotnet:1-7.0-jammy",
+	"onCreateCommand": "./scripts/load_submodule.sh",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-dotnettools.csdevkit"
+			]
+		}
+	}
+}

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "dotnet.defaultSolution": "neo-devpack-dotnet.sln"
+}