Add: more examples to README

Dockerfile

@@ -1,4 +1,4 @@
-FROM interlegis/alpine-postfix 
+FROM interlegis/alpine-postfix:3.3.0 
 
 LABEL maintainer="Danya Sliusar <[email protected]>"
 

Makefile

@@ -1,6 +1,5 @@
 APP_NAME=sendmail-http
 
-
 all: build
 
 build:

README.md

@@ -1,20 +1,55 @@
 # sendmail http
 
-Simple http server for sendmail (based on postfix alpine)
+
+
+Simple http server with Email sending. Now support Sendmail and Mutt as backend.
+
+
 
 ## Build
 
-Binary can be built by execute:
+ 
 
-```
-make build
+Binary can be built by *make*:
 
+```bash
+make build
+# this creates binary in *bin* directory
+ls bin/
+# sendmail-http
 ```
 
-To make docker image exec:
+To make Docker image:
 
+```bash
+make docker
+# or building by your own image
+docker build -t your-own/sendmail-http .
 ```
 
-make docker
+## Running
 
+```bash
+# Running directly with Docker
+docker run -d -t --name sendmail \
+    -p 1001:1001 \
+    danyanya/sendmail-http:latest
+# or by docker-compose
+docker-compose up -d
 ```
+
+## Usage
+
+For send email use **/api/sendmutt** endpoint:
+
+```bash
+# Get params are from, to, subject and body:  
+curl -sSl localhost:1001/sendmutt?[email protected]&[email protected]&subject=[job%20offer]&body=Confirmation,$%20Steve!
+
+# Also it accepts file, but it needed to be in container!
+#!! &file=/tmp/some.xls
+```  
+
+## Copyright
+
+Repo created by Daniil Sliusar at 2019.

main.go

@@ -81,7 +81,7 @@ func main() {
 
 	var apiGroup = e.Group("/api")
 
-	// GET HTTP endpoint to send Emails with sendmail
+	// GET HTTP endpoint to send emails via sendmail
 	apiGroup.GET("/sendmail", func(c echo.Context) error {
 
 		var req = mailReq{}
@@ -101,8 +101,8 @@ func main() {
 		)
 	})
 
+	// GET HTTP endpoint to send emails via mutt
 	apiGroup.GET("/sendmutt", func(c echo.Context) error {
-
 		var req = mailReq{}
 		if err := c.Bind(&req); err != nil {
 			return c.JSON(http.StatusBadRequest,
@@ -120,8 +120,7 @@ func main() {
 		)
 	})
 
-	var err = e.Start(serverAddr)
-	if err != nil {
+	if err := e.Start(serverAddr); err != nil {
 		panic(err.Error())
 	}