feat: initial commit

legacy/README.md

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+Legacy Updater Tool
+===================
+
+This updater exists to facilitate a transition from the legacy mirrors orchestration to its replacement.
+As far as I know, no one else has ever deployed the original orchestrator so this will almost certainly not be useful
+to you.
+
+Configuration
+-------------
+
+When working with the Docker Compose file, configure the sources via the environment file: `updater.env`.
+One environment variable per configured pool with an HTTP URL to the Bypass Censorship Mirrors JSON file for each pool.
+
+For example:
+
+```shell
+JASIMA_MIRRORS_POOL_example=https://www.example.com/mirrors.json
+```
+
+### Per-site Configurations
+
+In the configs directory, create a file named `default.json` to provide the default site configuration.
+Create files named `<host>.json` to override the default.
+This is a complete override so duplicate anything from the default you wanted to keep.