docs: add README

README.md

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+# Typstar
+Neovim plugin for efficient note taking in typst
+
+## Features
+- Powerful autosnippets using [LuaSnip](https://github.com/L3MON4D3/LuaSnip/) and [Tree-sitter](https://tree-sitter.github.io/) (inspired by [fastex.nvim](https://github.com/lentilus/fastex.nvim))
+- Easy insertion of drawings using [Obsidian Excalidraw](https://github.com/zsviczian/obsidian-excalidraw-plugin)
+- \[WIP\] Export of [Anki](https://apps.ankiweb.net/) flashcards
+
+## Usage
+
+### Snippets
+Use `:TypstarToggleSnippets` to toggle all snippets at any time.
+Available snippets can mostly be intuitively derived from [here](././lua/typstar/snippets), they include:
+
+- Alphanumeric characters: `:<char>` &#8594; `$<char>$ ` in markup (e.g. `:X` &#8594; `$X$ `, `:5` &#8594; `$5$ `)
+- Greek letters: `;<latin>` &#8594; `<greek>` in math and `$<greek>$ ` in markup (e.g. `;a` &#8594; `alpha`/`$alpha$ `)
+- Common indices (numbers and letters `i-m`): `<letter><index>` &#8594; `<letter>_<index>` in math and `$<letter>$<index> ` &#8594; `$<letter>_<index>$ ` in markup (e.g `A314` &#8594; `A_314`, `$alpha$n ` &#8594; `$alpha_n$ `)
+- Wrapping of any mathematical expression (see [operations](./lua/typstar/snippets/visual.lua), works nested, multiline and in visual mode via the [selection key](#installation)): `<expression><operation>` &#8594; `<operation>(<expression>)` (e.g. `(a^2+b^2)rt` &#8594; `sqrt(a^2+b^2)`, `lambdatd` &#8594; `tilde(lambda)`, `(1+1)sQ` &#8594; `[1+1]`, `(1+1)sq` &#8594; `[(1+1)]`)
+- Matrices: `<size>ma` and `<size>lma` (e.g. `23ma` &#8594; 2x3 matrix)
+- [ctheorems shorthands](./lua/typstar/snippets/document.lua) (e.g. `tem` &#8594; empty theorem, `exa` &#8594; empty example)
+- [Many shorthands](./lua/typstar/snippets/math.lua) for mathematical expressions
+
+Note that you can enable and disable collections of snippets in the [config](#configuration).
+
+### Excalidraw
+Use `:TypstarInsertExcalidraw` to create a new drawing using the configured template, insert a figure displaying it and open it in Obsidian.
+To open an inserted drawing in Obsidian, simply run `:TypstarOpenExcalidraw` while your cursor is on a line referencing the drawing.
+
+### Anki
+WIP
+
+## Installation
+Install the plugin in neovim and set the `typstarRoot` config or alternatively clone typstar into `~/typstar`.
+```lua
+require('typstar').setup({
+  typstarRoot = '/path/to/typstar/repo' -- depending on your nvim plugin system
+})
+```
+
+### Snippets
+1. Install [LuaSnip](https://github.com/L3MON4D3/LuaSnip/), set `enable_autosnippets = true` and set a visual mode selection key (e.g. `store_selection_keys = '<Tab>'`) in the configuration
+2. Install [jsregexp](https://github.com/kmarius/jsregexp) as described [here](https://github.com/L3MON4D3/LuaSnip/blob/master/DOC.md#transformations) (running `:lua require('jsregexp')` in nvim should not result in an error)
+3. Install [nvim-treesitter](https://github.com/nvim-treesitter/nvim-treesitter) and run `:TSInstall typst`
+4. Optional: Setup [ctheorems](https://typst.app/universe/package/ctheorems/) with names like [here](./lua/typstar/snippets/document.lua)
+
+### Excalidraw
+1. Install [Obsidian](https://obsidian.md/) and create a vault in your typst note taking directory
+2. Install the [obsidian-excalidraw-plugin](https://github.com/zsviczian/obsidian-excalidraw-plugin) and enable `Auto-export SVG` (in plugin settings at `Embedding Excalidraw into your Notes and Exporting > Export Settings > Auto-export Settings`)
+3. Have the `xdg-open` command working or set a different command at `uriOpenCommand` in the [config](#configuration)
+
+### Anki
+WIP
+
+## Configuration
+Configuration options can be intuitively derived from the table [here](./lua/typstar/config.lua).
+