Add technical/user documentation

[flyxiv]

Need document/video user guide for easier use

• introduction
  • [ ] KR
  • [ ] EN
• user guide
  • [ ] KR
  • [ ] EN
• in-depth explanation
  • [x] KR
  • [x] EN

[flyxiv]

Made intro documentation in blog: https://junyeopn.github.io/blog/docs/ffxivsimbot/

We need Introduction/User Guide/In-depth Theory Explanation

[flyxiv]

need EN and KR version of the documents.

[flyxiv]

Creating in-depth explanation in Korean first. Then I'm going to translate to English.

[flyxiv]

EN version is also done.