func GetManifest(filename string) (*Manifest, error) {
	jar, err := readFromFile(filename, false)
	if err != nil {
		return nil, err
	}
	return jar.Manifest, nil
}
GetManifest extracts the manifest info from a Java JAR file
It takes as parameter the path to the jar file of interest
It returns a pointer to a Manifest (map[string]string) which is the key:values pairs from the META-INF/MANIFEST.MF file
package jargo
import (
	"archive/zip"
	"bufio"
	"bytes"
	"io"
	"log"
	"os"
	"strings"
)
type Manifest map[string]string
type JarInfo struct {
	*Manifest
	Files []string
}
const MANIFEST_FULL_NAME = "META-INF/MANIFEST.MF"