Add Transmission package (#1920)

* Add files via upload

* Update transmission.rb

packages/transmission.rb

+require 'package'
+
+class Transmission < Package
+  description 'A fast, easy, and free BitTorrent client. https://transmissionbt.com/'
+  homepage 'https://github.com/transmission/transmission-releases'
+  version '2.93'
+  source_url 'https://github.com/transmission/transmission-releases/raw/master/transmission-2.93.tar.xz'
+  source_sha256 '8815920e0a4499bcdadbbe89a4115092dab42ce5199f71ff9a926cfd12b9b90b'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+  
+  depends_on 'libevent'
+  depends_on 'openssl'
+  depends_on 'miniupnpc'
+  depends_on 'curl'
+  depends_on 'zlibpkg'
+  depends_on 'glib'
+  depends_on 'rtmpdump'
+  depends_on 'ctorrent'
+
+  def self.build
+    system "sh autogen.sh"
+    system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX}"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install" # the steps required to install the package
+  end
+  
+end