caddy installation and enable HTTPS

caddy/readme.md

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+# Caddy web server and reverse proxy
+
+Usually we will have multiple services and websites running on our VPS. So we need a web server which will listen on `HTTP` and `HTTPS` ports and redirect the traffic to correct service.
+
+## Installation
+
+I'll install caddy as a `systemd` service on my ubuntu machine. Hence I'll following [debian docs](https://caddyserver.com/docs/install#debian-ubuntu-raspbian) to install caddy.
+To verify if caddy is installed and running run the following command.
+```bash
+sudo service caddy status
+```
+Caddy web server is now started on your VPS and you can visit `domain-name.com` and see the caddy homepage. Caddy homepage will tell you where to edit caddy config and where you can put your static files for your webserver.
+
+## TLS Certificates
+
+Right now Caddy is running on HTTP only `80` port. To use automatic HTTPS replace the `:80` port in caddy config to your domain name.
+Before that ensure DNS record of domain name points to IP address of VPS.
+```diff
+- :80 {
++ domain-name.com {
+}
+```
+
+After making any change to caddy config we also need to restart the caddy service.
+```bash
+sudo systemctl reload caddy
+```
+Now visit `domain-name.com` again and it will be serving site over HTTPS.
+Caddy will automatically provision and renew TLS certificates from [LetsEncrypt](https://letsencrypt.org)