Write contributor-facing documentation for amp-story

[newmuis]

This is a broad issue to cover a lot of things:

Priority	Category	Item
P0	General	General: Overview
P0	General	General: Design Principles
P0	General	General: Table of Contents
P1	Localization	Localization: Deprecating a string
P1	Localization	Localization: Updating a string
P1	Localization	Localization: Injecting the service
P1	Localization	Localization: Using a string translation
P1	Localization	Localization: Testing using pseudolocales
P1	StoreService	StoreService: Overview
P1	StoreService	StoreService: Adding a new property
P1	StoreService	StoreService: Retrieving a value (one-off)
P1	StoreService	StoreService: Listening for changes
P1	StoreService	StoreService: callToInitialize
P1	Pages	Page navigation: switchTo steps
P1	Analytics	Analytics: Injecting the service
P1	Analytics	Analytics: Adding a new trigger
P1	Analytics	Analytics: Adding a new variable
P1	UI	HTML templating
P1	UI	CSS file organization
P1	UI	Adding a new system UI component
P1	UI	UI Types
P2	MediaPool	MediaPool: Problem statement (iOS video limit)
P2	MediaPool	MediaPool: Problem statement (blessing audio)
P2	MediaPool	MediaPool: Problem statement (cancelling downloads)
P2	MediaPool	MediaPool: Life of a media element
P2	MediaPool	MediaPool: Default media
P2	MediaPool	MediaPool: Media tasks
P2	Bookend	Bookend: Components system
P2	Bookend	Bookend: History state
P2	Pages	Page navigation: Progress bar
P2	Pages	Page navigation: PageAdvancement
P2	Pages	Page navigation: History state
P2	Embedded Components	Embedded Components: Overview
P2	Embedded Components	Embedded Components: Config spec
P2	Embedded Components	Embedded Components: Adding a new component
P2	General	haxx.md
P2	Animations	Animation presets
P2	Pages	Distance attribute and positioning

[newmuis]

Updated with a more comprehensive list. I think this is something we should start on soon.

[CrystalOnScript]

@newmuis - can you cross out whats been documented from the table? Thanks!

[newmuis]

Done! (nothing has been documented 😟)

[CrystalOnScript]

Hahahahaha, thanks for the update!😂

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[newmuis]

@ampproject/wg-stories this is a great reminder for us to take a look at contributor-facing documentation. I don't know that the areas that I outlined above are the correct ones, but if you have ideas, please add them! We should find the right way to make meaningful progress on this list.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.