[no ci] Add Linux Dev Container (#448)

.devcontainer/linux/devcontainer.json

@@ -0,0 +1,11 @@
+{
+  "name": "SteamRT Sniper SDK",
+  "image": "registry.gitlab.steamos.cloud/steamrt/sniper/sdk:latest",
+  "customizations": { 
+    "vscode": {
+      "extensions": [
+        "ms-vscode.cpptools"
+      ]
+    }
+  }
+}

.editorconfig

@@ -10,5 +10,5 @@ indent_size = 4
 max_line_length = 140
 trim_trailing_whitespace = true
 
-[*.json]
+[{*.json,*.yaml,*.yml}]
 indent_size = 2