Updated readme file

README.md

@@ -1,2 +1,44 @@
-# RestGoMail
-HTTP-REST Mail gateway written in Go
+![RestGoMail logo](https://raw.githubusercontent.com/hyper-prog/restgomail/main/images/restgomail.png)
+
+RestGoMail - HTTP-REST Mail gateway in Go
+==========================================
+
+RestGoMail is a small daemon/container which able to receive HTML e-mail forward requests 
+as HTTP POST in a JSON data, queue the requests, and sends the specified
+mails to a SMTP server according to the settings.
+
+
+Compile / Install
+-----------------
+Server config file (JSON) - Have to pass in command line argument
+
+    {
+        "restgomail": {
+            "httpsListenPort": "443",
+            "smtpHost": "smtp.gmail.com",
+            "smtpPort": "587",
+            "smtpAuthRequired": true,
+            "smtpAuthPassword": "gmailpasswordsample",
+            "smtpAllowedFromAddressOnly": "sampleuser@gmail.com",
+            "tlsKeyFile": "restgomail.key",
+            "tlsCertFile": "restgomail.crt",
+            "allowOnlyKnownCertificates": true,
+            "knownCertificates": {
+                "clientOneContainer": "@one_client.crt",
+                "clientTwoContainer": "MIdjr6RfjfuESwekjEDffg..."
+            },
+            "debugMode": false
+        }
+    }
+
+E-mail send request (JSON) - Have to send as POST request to the 443 port (configured above)
+
+    {
+        "sendmail": {
+            "from": "sampleuser@gmail.com",
+            "to": "tomyfriend@postmail.com",
+            "subject": "This is a test message",
+            "bodyhtml": "Probably <i>I can say</i> this thing is <h1>WORK'S FLAWLESS!</h1>!"
+        }
+    }
+