Add pdfgrep package

packages/pdfgrep.rb

+require 'package'
+
+class Pdfgrep < Package
+  description 'a commandline utility to search text in PDF files'
+  homepage 'https://pdfgrep.org/'
+  version '2.0.1'
+  source_url 'https://pdfgrep.org/download/pdfgrep-2.0.1.tar.gz'
+  source_sha256 '0370d744b3072d47383dbed2cb9c8b0b64b83c084da5a8961f8d4bc7669e941e'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'poppler'
+
+  def self.build
+    system "./configure --prefix=#{CREW_PREFIX}"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end