add pyinstaller rule

malware/pyinstaller.yar

+/*
+    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.
+*/
+
+import "pe"
+
+rule PE_File_pyinstaller
+{
+    meta:
+        author = "Didier Stevens (https://DidierStevens.com)"
+        description = "Detect PE file produced by pyinstaller"
+        reference = "https://isc.sans.edu/diary/21057"
+    strings:
+        $a = "pyi-windows-manifest-filename"
+    condition:
+        pe.number_of_resources > 0 and $a
+}