update readme and add man page

Author: alexcoder04

README.md

@@ -12,6 +12,10 @@ bar chart.
 
 ## Installation
 
+### Arch Linux
+
+frei is available on the [AUR](https://aur.archlinux.org/packages/frei).
+
 ### Pre-compiled binaries
 
 Binaries for `i386`, `amd64` and `arm` are available on the [releases
@@ -31,7 +35,7 @@ go build .
 
 | option     | description                                 |
 |------------|---------------------------------------------|
-| `--help`   | show list of options                        |
+| `-help`    | show list of options                        |
 | `-h`       | human-readable numbers (implies `-numbers`) |
 | `-key`     | display color key                           |
 | `-numbers` | print numbers in addition to the chart      |

frei.1

@@ -0,0 +1,40 @@
+.TH "frei" "1" 
+
+.SH "NAME"
+.PP
+frei - modern replacement for the 'free' command-line utility
+
+.SH "SYNOPSIS"
+.PP
+frei [OPTIONS...]
+
+.SH "OPTIONS"
+
+.SS "-h"
+.PP
+Display human-readable numbers (implies `-numbers`)
+
+.SS "-help"
+.PP
+Print help message and exit
+
+.SS "-key"
+.PP
+Display color key
+
+.SS "-numbers"
+.PP
+Print numbers in addition to the chart
+
+.SS "-version"
+.PP
+Display version and exit
+
+.SH "DESCRIPTION"
+.PP
+frei is a modern replacement for the 'free' command-line utility which gives information about memory usage by drawing a colorful chart instead of displaying just the numbers
+
+.SH "AUTHOR"
+.PP
+alexcoder04 <alexcoder04@protonmail.com>
+

main.go

@@ -127,7 +127,7 @@ func main() {
 		if Version == "" {
 			fmt.Print("frei [built from source]")
 		} else {
-			fmt.Print("frei v" + Version)
+			fmt.Print("frei " + Version)
 		}
 		if CommitSHA != "" {
 			fmt.Print(" (commit " + CommitSHA + ")")