docs: add readme

README.md

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+# `python-azure-example`
+
+Just an example of a way to deploy Python app to Azure using Terraform.
+
+# Development
+
+### Dependencies
+ * [devbox](https://www.jetpack.io/devbox)
+ * [justfile](https://github.com/casey/just) (optional, `devbox run -- just` can be used instead)
+
+```sh
+# Configure
+cp example.env .env
+
+# Start local dev
+just run
+
+# Provision infrastructure
+just terraform apply
+
+# Deploy new code
+just deploy
+```