Add accent-letters package

packages/accent-letters/0.1.0/README.md

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+# Accent Letters
+
+Type any accented letter by its shape. `;e'` gives **é**, `;n~` gives **ñ**, `;c,` gives **ç**,
+`;o/` gives **ø**.
+
+257 triggers covering the accented letters of 55 languages.
+
+## The grammar
+
+`;` then the plain letter, then a symbol that looks like the mark:
+
+| Type | Get | | Type | Get |
+| --- | --- | --- | --- | --- |
+| `;e'` | é | | `;a*` | å |
+| ``;e` `` | è | | `;z.` | ż |
+| `;e^` | ê | | `;a-` | ā |
+| `;e"` | ë | | `;c<` | č |
+| `;n~` | ñ | | `;a(` | ă |
+| `;c,` | ç | | `;a;` | ą |
+| `;o=` | ő | | `;o/` | ø |
+
+The symbol is chosen to look like the mark it adds: `'` rises like an acute, `` ` `` falls like a
+grave, `^` is the circumflex's hat, `"` is the two dots of a diaeresis, `~` is a tilde. Capitals
+work the same way — `;E'` gives **É**.
+
+The same grammar works in the accent keyboard at
+[accentletters.wiki/tools/accent-keyboard/](https://accentletters.wiki/tools/accent-keyboard/), so
+a trigger learned in one works in the other.
+
+## Why `;`
+
+A leading `;` is an escape, so the triggers cannot fire while you are writing ordinary prose — a
+semicolon is followed by a space, not by a letter and a punctuation mark. Change it by editing
+`package.yml` if it clashes with how you type.
+
+## Where the letters come from
+
+Generated from Unicode 16.0.0 and CLDR 48.2.0 — the same data as the
+[Accent Letters](https://accentletters.wiki/) website, apps and add-ons, so a letter cannot differ
+between them. A trigger exists only where the base letter and the mark really compose into a single
+character, which is why there is no `;q'`: there is no such letter to give you.
+
+Letters that are not a base plus a mark at all — `ø ł đ` and their capitals, where the stroke goes
+through the letter rather than sitting on it — are reached with `/`: `;o/`, `;l/`, `;d/`.

packages/accent-letters/0.1.0/_manifest.yml

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+name: accent-letters
+title: Accent Letters
+description: >-
+  Type any accented letter by its shape: ;e' gives é, ;n~ gives ñ, ;c, gives ç, ;o/ gives ø.
+  257 triggers covering the accented letters of 55 languages, generated from Unicode
+  16.0.0 and CLDR 48.2.0.
+version: 0.1.0
+author: Accent Letters
+homepage: "https://accentletters.wiki/"
+tags: ["accents", "letters", "characters", "languages", "unicode", "diacritics"]