Updated Quickstart (markdown)

Quickstart.md

@@ -1 +1,65 @@
-TODO
+# Getting Started
+
+Let's start from making a normal NestJS app.
+
+```ts
+import { Controller, Get } from '@nestjs/common';
+import { AppService } from './app.service';
+
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get()
+  getHello(): string {
+    return this.appService.getHello();
+  }
+}
+```
+
+**Important:** This decorator package is only accepting asynchronous function for now.
+
+So we should change things to use async.
+
+```ts
+import { Controller, Get } from '@nestjs/common';
+import { AppService } from './app.service';
+
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get()
+  async getHello(): Promise<string> {
+    return await this.appService.getHello();
+  }
+}
+```
+
+This is the template you will get when you start with `nest new [name]`.
+
+Now install `nestlogged` package.
+
+```sh
+npm install nestlogged
+```
+
+Or,
+
+```sh
+yarn add nestlogged
+```
+
+# Add Logging
+
+In this package, logging decorator is separated by two kind.
+
+1. LoggedRoute is used for methods in Controllers, with method decorators like @Get, @Post, etc.
+
+2. LoggedFunction is used for methods in any other class methods, like service.
+
+So, we can add a LoggedRoute decorator in controller example above.
+
+```ts
+
+```