*: add a doc for development

developing.md

@@ -0,0 +1,33 @@
+# Developing
+
+## Requirements
+
+* `make`
+* `shellcheck` (package `ShellCheck` on fedora)
+* `bats`
+* `wget`
+* `podman` (or `docker`)
+* `jq`
+
+## Lint
+
+[ShellCheck](https://www.shellcheck.net/) is used to ensure the shell script is nice and tidy.
+
+```bash
+make validate
+```
+
+## Tests
+
+Testing is done with [`bats`](https://github.com/bats-core/bats-core).
+
+While it's possible to kick the tests by calling `bats ./test/`, many of the tests are written to use the script as built into a container image.
+If you are making local changes and have not rebuilt the container, then they will be missed.
+
+Best to kick off the build like:
+```bash
+make test-integration
+```
+This will rebuild the container if needed before running the tests.
+
+##