Create README.md

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+# caddy
+
+A tiny 4MB Caddy image compressed with [UPX](https://github.com/upx/upx).
+
+# Caveats 
+
+Since this image is `FROM scratch`, it does not have the certificates 
+necessary to connect to external HTTPS servers, including Let's Encrypt's 
+ACME server. This means that automatic TLS will not work in this Docker 
+image. 
+
+TODO: add [ca-certificates.crt](https://curl.haxx.se/ca/cacert.pem) in /etc/ssl/certs/