Add commands package inside src directory

Author: koesie10

extensions/ql-vscode/src/packages/commands/CommandManager.ts

@@ -0,0 +1 @@
+export class CommandManager {}

extensions/ql-vscode/src/packages/commands/index.ts

@@ -0,0 +1 @@
+export * from "./CommandManager";

extensions/ql-vscode/test/unit-tests/packages/commands/CommandManager.test.ts

@@ -0,0 +1,8 @@
+import { CommandManager } from "../../../../src/packages/commands";
+
+describe(CommandManager.name, () => {
+  it("can create a command manager", () => {
+    const commandManager = new CommandManager();
+    expect(commandManager).not.toBeUndefined();
+  });
+});