++ Added root.pem and chain.pem to the SSL full certificates

PATH_SSL_ROOT_PEM
PATH_SSL_CHAIN_PEM

README.md

@@ -21,6 +21,28 @@ cp .env.development .env.test
 
 And modifying the file with your configuration
 
+### Certificates
+
+Once you have gone through the process of getting your Let’s Encrypt certificates you will have 4 certificates:
+
+```bash
+cert.pem
+chain.pem
+fullchain.pem
+privkey.pem
+```
+
+You will need to download the root certificate (root.pem) and an intermediate certificate (chain.pem) from Let’s Encrypt – https://letsencrypt.org/certificates/
+
+See this article:
+https://www.psclistens.com/insight/blog/enabling-a-nodejs-ssl-webserver-using-let-s-encrypt-pem-certificates/
+
+
+To see if all the certificates are OK, see this page check and enter the correct host and port:
+https://decoder.link/sslchecker
+
+For example:
+https://decoder.link/sslchecker/test.freeplanet.app/3001
 
 ### Build the ambient test