docs: add new API documentation (#27)

* add new api docs in readme

* update api docs location

* add curl, fix indetation, add enter after heading

* add set completed and monitoring curl

* update readme.md

* Fix capitalisation

Co-authored-by: Resi Respati <resir014@gmail.com>

* add curl docs for check account status

* add example response for account status

Co-authored-by: Resi Respati <resir014@gmail.com>
Co-authored-by: Zain Fathoni <me@zainf.dev>

README.md

@@ -60,3 +60,7 @@ See our contribution guidelines in these languages:
 - [Indonesian](CONTRIBUTING_ID.md)
 
 When contributing to our project, please use English when communicating with other people in issues and/or pull requests. [Click here](CONTRIBUTING.md#why-are-we-using-english-in-our-issues--prs) to read why. ([Bahasa Indonesia](CONTRIBUTING_ID.md#mengapa-kita-menggunakan-bahasa-inggris-dalam-menulis-issue-dan-pull-request))
+
+## API
+
+Our API documentation is in [api-refrence.md](docs/api-reference.md) file.