Document installation and usage.

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 # webgen
+
 The static site generator for my site.
+
+## Requirements
+
+[Janet](https://janet-lang.org/) is required to build and run the generator.
+
+[pandoc](https://pandoc.org/) is required for processing markdown files.
+
+## Build
+
+```
+jpm build
+```
+
+## Usage
+
+```
+webgen src/
+```
+
+where `src/` is the directory to the site's source files.