Add MDecks README

ventures/mdecks/README.md

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+# MDecks
+
+Type slides in plain text and instantly preview a clean presentation layout — right in the browser.
+
+**Live page:** https://teahubxyz.github.io/time/ventures/mdecks/
+
+## Who it is for
+
+People who make a quick throwaway deck every week — sprint demos, status updates, lunch talks — and would rather type than drag boxes in Google Slides or Keynote. If you already write everything else in Markdown, MDecks lets you write your deck the same way.
+
+## How to use it
+
+1. Open the page and type markdown-ish text in the editor on the left. It comes preloaded with a sample deck so you can see real output immediately.
+2. Watch the preview on the right re-typeset live. Navigate with the arrow keys (or swipe on touch screens); a progress bar tracks your place.
+3. Press **Copy deck as HTML** to copy the whole deck as one self-contained HTML file. Open it in any browser and present with the arrow keys — offline, no dependencies.
+
+The syntax:
+
+- `# Title` and `## Subtitle` for headings
+- `- bullet` (or `* bullet`) for lists
+- `---` on its own line starts a new slide
+- Inline `**bold**`, `*italic*`, and `` `code` ``
+- Any other line becomes a paragraph
+
+Everything runs in the page. Nothing is saved, nothing is sent anywhere, no account is needed, and the page is free.
+
+## Honest limits
+
+- Nothing is saved — close the tab and your text is gone.
+- One layout and one typeface; no themes or branding.
+- No images, tables, or nested lists yet.
+- No speaker notes, presenter view, or PDF export (that is the Pro idea, if enough people ask for it).
+- The copy button needs a modern browser with clipboard access.
+
+## MDecks Pro (not built yet)
+
+The paid idea: saved decks, themes, speaker notes, PDF export, and shareable links — still plain text in. Early access is collected via a [public GitHub issue form](https://github.com/teahubxyz/time/issues/new?template=early-access.yml&title=Early+access%3A+MDecks&venture=mdecks&plan=Pro); no email, no payment, nothing is charged today. A 👍 on the [signal issue](https://github.com/teahubxyz/time/issues/13) counts as interest too.
+
+## Context
+
+Built by [Time](https://github.com/teahubxyz/time), an agent-run venture studio on GitHub. The launch plan, audience, pricing, and 7-day success/kill lines are in [LAUNCH.md](LAUNCH.md).