added simple README.md on vscode-extension

tools/vscode-extension/README.md

@@ -0,0 +1,155 @@
+# Prometeu VS Code Extension
+
+VS Code bridge for Prometeu Studio.
+
+This extension does **not** start the language server itself. It connects to the Prometeu Studio LSP server running locally.
+
+```text
+VS Code Extension
+    -> vscode-languageclient
+    -> TCP 127.0.0.1:7777
+    -> Prometeu Studio Java/LSP4J
+```
+
+## Requirements
+
+* Node.js
+* npm
+* VS Code
+* Prometeu Studio running with the embedded LSP server enabled
+
+The Studio LSP server must be listening on:
+
+```text
+127.0.0.1:7777
+```
+
+## Install dependencies
+
+From this directory:
+
+```bash
+npm install
+```
+
+## Compile
+
+```bash
+npm run compile
+```
+
+This generates:
+
+```text
+out/extension.js
+```
+
+## Run in development mode
+
+Open this extension folder in VS Code:
+
+```bash
+code .
+```
+
+Press:
+
+```text
+F5
+```
+
+This opens a second VS Code window called **Extension Development Host**.
+
+In that second window, open a Prometeu project and create/open a file like:
+
+```text
+main.pbs
+```
+
+or:
+
+```text
+main.barrel
+```
+
+Expected output in:
+
+```text
+View -> Output -> Prometeu LSP
+```
+
+```text
+Prometeu VS Code extension activated.
+Connecting to Prometeu Studio LSP at 127.0.0.1:7777...
+TCP connection established with Prometeu Studio.
+Prometeu Studio LSP client started.
+[Info] Hello from Prometeu Studio LSP
+```
+
+## Run commands manually
+
+In the Extension Development Host window:
+
+```text
+Cmd+Shift+P
+Prometeu: Connect to Studio LSP
+```
+
+To restart the client:
+
+```text
+Cmd+Shift+P
+Prometeu: Restart Studio LSP
+```
+
+## Package as VSIX
+
+```bash
+npm run compile
+vsce package --allow-missing-repository
+```
+
+This creates a file like:
+
+```text
+prometeu-vscode-extension-0.0.1.vsix
+```
+
+## Install locally
+
+```bash
+code --install-extension prometeu-vscode-extension-0.0.1.vsix --force
+```
+
+Then open a Prometeu project normally:
+
+```bash
+code /path/to/prometeu-project
+```
+
+With Prometeu Studio running, opening `.pbs` or `.barrel` files should activate the extension and connect to the Studio LSP server.
+
+## Configuration
+
+Default settings:
+
+```json
+{
+  "prometeu.studio.host": "127.0.0.1",
+  "prometeu.studio.port": 7777
+}
+```
+
+These can be changed in VS Code settings if needed.
+
+## Current status
+
+The extension currently provides only the minimal LSP client bridge:
+
+* registers `.pbs`
+* registers `.barrel`
+* connects to Prometeu Studio over TCP
+* starts a VS Code `LanguageClient`
+* receives LSP messages from the Java/LSP4J server
+
+The Studio remains the source of trut