Added vscode syntax highlighting under /tools

tools/toylang.vscode-highlighting/.vscode/launch.json

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+// A launch configuration that launches the extension inside a new window
+// Use IntelliSense to learn about possible attributes.
+// Hover to view descriptions of existing attributes.
+// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+{
+	"version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Extension",
+            "type": "extensionHost",
+            "request": "launch",
+            "args": [
+                "--extensionDevelopmentPath=${workspaceFolder}"
+            ]
+        }
+    ]
+}

tools/toylang.vscode-highlighting/.vscodeignore

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+.vscode/**
+.vscode-test/**
+.gitignore
+vsc-extension-quickstart.md

tools/toylang.vscode-highlighting/CHANGELOG.md

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+# Change Log
+

tools/toylang.vscode-highlighting/README.md

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+# Toy vscode Highlighting
+
+This is included in the core repo under `/tools`, and is supposed to make your time writing Toy code easier.
+
+## Installing
+
+Just copy the whole folder into the extensions folder for VSCode.
+

tools/toylang.vscode-highlighting/language-configuration.json

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+{
+    "comments": {
+        // symbol used for single line comment. Remove this entry if your language does not support line comments
+        "lineComment": "//",
+        // symbols used for start and end a block comment. Remove this entry if your language does not support block comments
+        "blockComment": [ "/*", "*/" ]
+    },
+    // symbols used as brackets
+    "brackets": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"]
+    ],
+    // symbols that are auto closed when typing
+    "autoClosingPairs": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"],
+        ["\"", "\""],
+    ],
+    // symbols that can be used to surround a selection
+    "surroundingPairs": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"],
+        ["\"", "\""],
+    ]
+}

tools/toylang.vscode-highlighting/package.json

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+{
+  "name": "toy-syntax-highlighting",
+  "displayName": "Toy Syntax Highlighting",
+  "description": "A toy programming language",
+  "version": "0.0.1",
+  "engines": {
+    "vscode": "^1.73.0"
+  },
+  "categories": [
+    "Programming Languages"
+  ],
+  "contributes": {
+    "languages": [{
+      "id": "toy",
+      "aliases": ["Toy", "toy"],
+      "extensions": [".toy"],
+      "configuration": "./language-configuration.json"
+    }],
+    "grammars": [{
+      "language": "toy",
+      "scopeName": "source.toy",
+      "path": "./syntaxes/toy.tmLanguage.json"
+    }]
+  }
+}

tools/toylang.vscode-highlighting/syntaxes/toy.tmLanguage.json

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+{
+	"$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
+	"name": "Toy",
+	"patterns": [
+		{
+			"include": "#comments"
+		},
+		{
+			"include": "#keywords"
+		},
+		{
+			"include": "#strings"
+		},
+		{
+			"include": "#numbers"
+		},
+		{
+			"include": "#booleans"
+		},
+		{
+			"include": "#null"
+		},
+		{
+			"include": "#reserved"
+		}
+	],
+	"repository": {
+		"comments": {
+			"patterns": [{
+				"name": "comment.line.toy",
+				"begin": "\/\/",
+				"end": "\\n"
+			},
+			{
+				"name": "comment.block.toy",
+				"begin": "/\\*",
+				"end": "\\*/"
+			}]
+		},
+		"keywords": {
+			"patterns": [{
+				"name": "keyword.control.toy",
+				"match": "\\b(if|else|while|for|return|break|continue)\\b"
+			},
+			{
+				"name": "keyword.type.toy",
+				"match": "\\b(any|bool|const|float|int|string|type)\\b"
+			},
+			{
+				"name": "keyword.other.toy",
+				"match": "\\b(as|astype|assert|export|fn|import|print|typeof|var)\\b"
+			}]
+		},
+		"strings": {
+			"name": "string.quoted.double.toy",
+			"begin": "\"",
+			"end": "\""
+		},
+		"numbers": {
+			"patterns": [{
+				"match": "[-]?[0-9]+(.[0-9]+)?",
+				"name": "constant.numeric.toy"
+			}]
+		},
+		"booleans": {
+			"patterns": [{
+				"match": "\\b(true|false)\\b",
+				"name": "constant.numeric.toy"
+			}]
+		},
+		"null": {
+			"patterns": [{
+				"match": "\\b(null)\\b",
+				"name": "constant.numeric.toy"
+			}]
+		},
+		"reserved": {
+			"patterns": [{
+				"name": "keyword.reserved.toy",
+				"match": "\\b(class|do|foreach|in|of)\\b"
+			}]
+		}
+	},
+	"scopeName": "source.toy"
+}