add doc for config

.gitignore

@@ -1 +1,2 @@
 version.go
+dist/

README.md

@@ -13,6 +13,7 @@ usage: secure [-addr host:port] -cert certfile -key keyfile upstream
         path to cert file
   -key string
         path to key file
+  -c configfile
   upstream string
         upstream url
 ```
@@ -22,3 +23,10 @@ usage: secure [-addr host:port] -cert certfile -key keyfile upstream
 secure -cert cert.pem -key key.pem http://localhost:6060
 ```
 
+## Configfile
+```yaml
+cert: proxy.crt 
+key: proxy.key
+upstream: https://somehost:123
+addr: 8080
+```

main.go

@@ -7,7 +7,6 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"gopkg.in/yaml.v3"
 	"io/ioutil"
 	"log"
 	"net/http"
@@ -16,13 +15,16 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"syscall"
+
+	"gopkg.in/yaml.v3"
 )
 
 type Config struct {
-	CertFile string `yaml:"certfile"`
-	KeyFile  string `yaml:"keyfile"`
+	CertFile string `yaml:"cert"`
+	KeyFile  string `yaml:"key"`
 	Upstream string `yaml:"upstream"`
 	Addr     string `yaml:"addr"`
 }
@@ -65,6 +67,10 @@ func getConfig() (config *Config, err error) {
 		if err != nil {
 			return nil, fmt.Errorf("cant parse config, %v", err)
 		}
+		if _, err := strconv.Atoi(cfg.Addr); err == nil {
+			cfg.Addr = ":" + cfg.Addr
+
+		}
 		return &cfg, nil
 	}