added instructions to enable https/ssl

.gitignore

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+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+
+# system related
+.DS_Store
+.thumbs.db

docs/enable-https.md

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+# Adding support for HTTPS/SSL
+
+> All the following instructions should be adapted to your personal needs
+
+If your plan to work locally only, first generate your self-signed cert and key:
+
+```bash
+openssl req -x509 -nodes -newkey rsa:2048 -keyout https.key -out https.crt -subj "/CN=localhost" -days 5000
+```
+
+Then copy your cert files on build stage of your Dockerfile:
+
+```Dockerfile
+FROM trafex/php-nginx:latest
+
+# ...
+
+COPY https.crt /etc/nginx/ssl/default.crt
+COPY https.key /etc/nginx/ssl/default.key
+
+# ...
+
+```
+
+Edit your nginx.conf file.
+
+> Check [Nginx configuration](../config/nginx.conf) for more help:
+
+
+```nginx
+server {
+    listen [::]:443 ssl;
+    listen 443 ssl;
+    server_name localhost;
+    root /var/www/html/public;
+
+    ssl_certificate /etc/nginx/ssl/default.crt;
+    ssl_certificate_key /etc/nginx/ssl/default.key;
+
+    # ... the rest here
+}
+```
+
+If you use docker-compose here is an example:
+
+```yaml
+  php-nginx:
+    build: ./api
+    networks: [ backend ]
+    ports: [ "443:443" ]
+    working_dir: /var/www/html
+    volumes:
+      - ./api:/var/www/html
+      - ./api/nginx.conf:/etc/nginx/conf.d/default.conf
+    restart: on-failure
+
+```
+
+Finally rebuild and restart your docker/compose.