feat: Adds caddy readme.

caddy/README.md

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+# Caddy
+
+Caddy is a web-server, commonly used as a reverse proxy (meaning it sits in
+front of other services and routes traffic to them).  It offers SSL certificates
+via Let's Encrypt.
+
+## Usage
+
+This directory has the basic set of files needed to create a caddy server.
+Because caddy uses a plugin architecture, the Dockerfile builds the image that
+is used, which includes cloudflare's DNS provider for verifying the domain of
+the server in order for it to obtain SSL certificates.
+
+## Environment Variables
+
+The `.env` file has the common environment variables needed in order to obtain
+SSL certificates, these values need to be updated.
+
+## Caddyfile
+
+The configuration for the caddy server is found in the `caddy/Caddyfile`.  There
+is a block included as an example of setting up a reverse proxy that will issue
+a wildcard certificate for the domains that are listed.
+
+## Network
+
+The proxy network needs to be created prior to starting the container.  You can
+use the following command to create the network:
+
+```bash
+docker network create --driver=bridge proxy
+```
+
+This allows you to place other containers running on the same host on this
+network and configure the reverse proxy using their container name.
+