feat: add lean

packages/lean/0.1.0/README.md

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+# Lean abbreviations
+
+This package contains all input abbreviations
+used by the [Lean theorem prover](https://leanprover.github.io).
+They are the same abbreviations used by the editor plugins
+for VS Code, neovim, and (with some differences) Emacs.
+
+For example, you can type `L\exists \all N` to get `L∃∀N`.
+
+Please note that the behavior of the espanso expansions
+is slightly different from how the editor plugins work:
+you need to write the abbreviation name in full,
+and you need to type a space after every abbreviation.
+
+If you want to use a leader character other than `\`
+(e.g., `,all ` instead of `\all `),
+please check out and adapt the
+[Python script](https://github.com/gebner/espanso-lean)
+that generates this package.
+
+## Installation
+
+Install [espanso](https://espanso.org/install/), then run:
+```
+espanso install lean
+```

packages/lean/0.1.0/_manifest.yml

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+name: "lean"
+title: "Lean input abbreviations"
+description: Input abbreviations for unicode symbols for the Lean theorem prover
+version: 0.1.0
+author: Gabriel Ebner
+tags: ["latex"]