feat: Add ProXPL VS Code extension for language support and update project version to 0.7.0.

Author: ProgrammerKR

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.15)
-project(ProXPL VERSION 0.6.0)
+project(ProXPL VERSION 0.7.0)
 
 # Enable C and C++
 enable_language(C CXX)

README.md

@@ -302,6 +302,19 @@ func showcase_stdlib() {
 }
 ```
 
+### Foreign Function Interface (FFI)
+
+ProXPL can invoke native C functions from dynamic libraries (`.dll`, `.so`) using the `extern` keyword.
+
+```javascript
+// Load C standard library
+extern "msvcrt.dll" "puts" func c_puts(text);
+extern "msvcrt.dll" "abs" func c_abs(n);
+
+c_puts("Hello from C!");
+let dist = c_abs(-100);
+```
+
 ---
 
 ## 📦 Package Manager (PRM)

docs/language-spec/LANGUAGE_SPEC.md

@@ -986,6 +986,34 @@ func main() {
 main();
 ```
 
+
+---
+
+## Foreign Function Interface
+
+ProXPL supports loading and calling external native functions using the `extern` declaration.
+
+### Syntax
+```javascript
+extern "libname" "symbol" func name(param1, param2);
+```
+
+- **libname**: Path or name of the dynamic library (`.dll`, `.so`, `.dylib`).
+- **symbol**: Exact name of the exported symbol in the library.
+- **name**: Name used to call the function within ProXPL.
+- **params**: Parameter names (types are marshalled automatically).
+
+### Type Marshalling
+
+| ProXPL Type | C Type (Argument) | C Type (Return) |
+|-------------|-------------------|-----------------|
+| `Number`    | `int` / `double`  | `int` (default) |
+| `String`    | `char*`           | `char*`         |
+| `Bool`      | `int`             | `int`           |
+| `Null`      | `NULL`            | `NULL`          |
+
+> **Note**: The current implementation primarily supports integer return types. Support for floating-point and void returns is planned.
+
 ---
 
 ## Conclusion

extension/package.json

@@ -2,7 +2,7 @@
   "name": "proxpl",
   "displayName": "ProXPL Language Support",
   "description": "Syntax highlighting and language support for the ProXPL programming language",
-  "version": "0.6.0",
+  "version": "0.7.0",
   "publisher": "ProXentix",
   "repository": {
     "type": "git",