Clarify Readme steps to add new sample

[mikehoffms]

Related PRs:

• Update "CSS features reference" MicrosoftDocs/edge-developer#3771
• CSS at-rules demos #135
• Clarify Readme steps to add new sample #137

Rendered page for review:

• Microsoft Edge demos (main Readme)

  • ~/README.md
  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/README.md
  • Clarified Adding a new demo.
  • Nested sections:
    • Contributing
      • Adding a new demo
  • Deleted syncing/maintenance comments.
    • PR #3771 deleted the dup tables from docset, to avoid having to sync dup content.
    • Merged that content (eg. PWA samples sections) into Readmes.
  • Changed title to sentence-case.
  • Fixed 404 due to relative path.
  • Changed What's New to What's new 3x.
  • Listed 4 ways to clone repo, linked to GH Docs.
  • Changed 80-col wrap to non-wrapped.
  • Updated link text as [Inspect CSS Grid layouts].

• Various demo Readmes:

  • Merged-in content from docs repo.
    • To no longer have to sync dup tables/info across Demos repo readme's & docset repo.
  • Cleaned up.

• /1DIV/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/1DIV/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/1DIV/README.md
  • Changelist:

• /email-client/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/email-client/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/email-client/README.md
  • Changelist:

• /opaque-range/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/opaque-range/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/opaque-range/README.md
  • Removed /en-us/

• /opaque-range/index.html

  • Before/live:
  • Removed /en-us/

• /pwa-background-sync/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/pwa-background-sync/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/pwa-background-sync/README.md
  • Changelist:

• /pwa-file-handlers/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/pwa-file-handlers/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/pwa-file-handlers/README.md
  • Changelist:

• /pwa-installer/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/pwa-installer/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/pwa-installer/README.md
  • Changelist:

• /pwa-installer/index.html

  • Before/live:
  • Changelist:

• /pwa-pwastore/index.html

  • Before/live:
  • Changelist:

• /pwa-timer/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/pwa-timer/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/pwa-timer/README.md
  • Changelist:

• /pwa-to-do/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/pwa-to-do/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/pwa-to-do/README.md
  • Changelist:

• /pwamp/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/pwamp/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/pwamp/README.md
  • Changelist:

• /scoped-custom-element-registries/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/scoped-custom-element-registries/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/scoped-custom-element-registries/README.md
  • Changelist:

• /temperature-converter/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/temperature-converter/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/temperature-converter/README.md
  • Changelist:

• /template/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/template/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/template/README.md
  • Changelist:

• /template/index.html

  • Preview:
  • Before/live:
  • Changelist:

• /template/script.js

  • Changelist:

• /wami/README.md

  • Preview: https://github.com/mikehoffms/Demos/blob/user/mikehoffms/readme-tables-links/wami/README.md
  • Before/live: https://github.com/MicrosoftEdge/Demos/blob/main/wami/README.md
  • Changelist:

AB#62380953

[mikehoffms]

LGTM - Content Developer/ Writer/Editor