docs: tls for local deployment

docs/tls-for-local-deployment.md

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+# Accessing ERPNext through https on local deployment
+
+- ERPNext container deployment can be accessed through https easily using Caddy web server, Caddy will be used as reverse proxy and forward traffics to the frontend container.
+
+### Prerequisites
+
+- Caddy
+- Adding a domain name to hosts file
+
+#### Installation of caddy webserver
+
+- Follow the official Caddy website for the installation guide https://caddyserver.com/docs/install
+  After completing the installation open the configuration file of Caddy ( You find the config file in ` /etc/caddy/Caddyfile`), add the following configuration to forward traffics to the ERPNext frontend container
+
+```js
+erp.localdev.net {
+  tls internal
+
+  reverse_proxy localhost:8085 {
+
+  }
+}
+```
+
+- Caddy's root certificate must be added to other computers if computers from different networks access the ERPNext through https.