Update .gitignore and README.md for CODESYS MCP project. Added entries to .gitignore for VSIX files and VS Code settings. Expanded README to include architecture, components, deployment instructions, and details about the Cursor extension.

vscode_codesys_companion/src/state.ts

@@ -0,0 +1,15 @@
+import * as vscode from "vscode";
+
+const ACTIVE_PROJECT_KEY = "codesys.activeProjectPath";
+
+export class ExtensionState {
+  constructor(private readonly context: vscode.ExtensionContext) {}
+
+  public get activeProjectPath(): string {
+    return this.context.globalState.get<string>(ACTIVE_PROJECT_KEY, "");
+  }
+
+  public async setActiveProjectPath(path: string): Promise<void> {
+    await this.context.globalState.update(ACTIVE_PROJECT_KEY, path);
+  }
+}