Add initial chapter titles

[hgzimmerman]

I'd like to take a stab at contributing to this project, but would at least like an outline of what content is needed.

I think it would make sense to break apart what is currently in the Readme for Yew into individual chapters and go more in-depth with their content.

Just to get something out there, I think the following chapters covering these subsections could be a good place to start:

• Intro
• Getting started
  • links to template projects
  • Minimal template code ("do it" example) currently in Readme.
  • CargoWeb vs wasm-bindgen
• Component lifecycle
  • Common: Create, Update, Change, View
  • More obscure/ Actor related: On Mount, Destroy
  • Props & Callbacks
• html! macro
  • Syntax similarities vs normal html vs JSX
    • Explanation of closure -> Callback conversion (??)
    • Comments
  • SVG support
  • Fragments
• Actors
  • Description of actor pattern, how Yew uses it.
  • Explanation of different Reaches (eg: which thread is this code running on?).
  • Examples for Job, Context, Public.
• Services
  • Existing services
  • How to wrap JS libs.
  • Serde.
• Novel Patterns and Examples
  • Sender/Receiver Actor pattern.
  • Actor wrapping a Service.
  • Canvas use.
  • Maybe steal some code from yew/examples/.
  • Encourage people to open PRs with novel uses of Yew.

[hgzimmerman]

• How to interoperate with JS.
  • How to import and use JS libs
  • How to include the js libs in a build toolchain, so they get minified and tree-shaken