extensions/git/src/repository.ts/Repository/stage
class Repository:	async stage(resource: Uri, contents: string): Promise<void> {
		const relativePath = path.relative(this.repository.root, resource.fsPath).replace(/\\/g, '/');
		await this.run(Operation.Stage, () => this.repository.stage(relativePath, contents));
		this._onDidChangeOriginalResource.fire(resource);
	}