Add 'Green Demo' built-in theme (green background for demo)

extensions/theme-green-demo/README.md

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+# Green Demo Theme
+
+A very simple built-in color theme that turns the workbench and editor backgrounds green for demo screenshots.
+
+## How to use
+
+1. Open the Command Palette.
+   - Windows/Linux: `Ctrl` + `K`, then `Ctrl` + `T`
+   - macOS: `⌘` + `K`, then `⌘` + `T`
+2. Choose "Color Theme".
+3. Select "Green Demo".
+
+You should see greenish hues across the editor and workbench suitable for a screenshot.

extensions/theme-green-demo/package.json

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+{
+  "name": "theme-green-demo",
+  "displayName": "Green Demo",
+  "description": "A simple green demo theme for screenshot purposes.",
+  "version": "0.0.1",
+  "publisher": "vscode",
+  "license": "MIT",
+  "engines": {
+    "vscode": "*"
+  },
+  "categories": ["Themes"],
+  "contributes": {
+    "themes": [
+      {
+        "id": "green-demo",
+        "label": "Green Demo",
+        "uiTheme": "vs-dark",
+        "path": "./themes/green-color-theme.json"
+      }
+    ]
+  },
+  "activationEvents": []
+}

extensions/theme-green-demo/themes/green-color-theme.json

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+{
+  "$schema": "vscode://schemas/color-theme",
+  "name": "Green Demo",
+  "type": "dark",
+  "colors": {
+    "activityBar.background": "#002200",
+    "sideBar.background": "#002a00",
+    "editor.background": "#003300",
+    "editor.foreground": "#E6FFE6",
+    "editorLineNumber.foreground": "#66aa66",
+    "editorGroupHeader.tabsBackground": "#002a00",
+    "tab.activeBackground": "#003300",
+    "tab.inactiveBackground": "#002a00",
+    "titleBar.activeBackground": "#003300",
+    "titleBar.inactiveBackground": "#002a00",
+    "statusBar.background": "#003300",
+    "editorWidget.background": "#002a00",
+    "focusBorder": "#006600",
+    "selection.background": "#00660055"
+  },
+  "tokenColors": [
+    { "settings": { "foreground": "#E6FFE6" } },
+    { "scope": "comment", "settings": { "foreground": "#8FBF8F", "fontStyle": "italic" } },
+    { "scope": "string", "settings": { "foreground": "#B7FFB7" } },
+    { "scope": "keyword", "settings": { "foreground": "#7FE57F" } }
+  ],
+  "semanticHighlighting": true
+}