feat: add config file for debug with vscode

.gitignore

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+/.obj
+qjs-debug
+qjsc
+repl.c
+qjscalc.c

.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Mac",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [],
+            "macFrameworkPath": [
+                "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks"
+            ],
+            "compilerPath": "/usr/bin/clang",
+            "cStandard": "c11",
+            "cppStandard": "c++11",
+            "intelliSenseMode": "clang-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/launch.json

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+{
+  // 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": "qjs-debug main.js",
+      "type": "cppdbg",
+      "request": "launch",
+      "program": "${workspaceRoot}/qjs-debug",
+      "args": [
+         "${workspaceFolder}/example/hello.js"
+      ],
+      "stopAtEntry": true,
+      "cwd": "${workspaceFolder}",
+      "environment": [],
+      "externalConsole": false,
+      "MIMode": "lldb",
+      "setupCommands": [
+        {
+          "description": "Enable pretty-printing for gdb",
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        }
+      ],
+      "logging": {"engineLogging": true},
+      "preLaunchTask": "gcc build active file"
+    }
+  ]
+}

.vscode/tasks.json

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+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "gcc build active file",
+      "type": "shell",
+      "command": "make qjs-debug"
+    }
+  ]
+}