Add manifest file for Python v3.8.5 x64 (#2630)

manifests/Python/Python/3.8.5.yaml

@@ -0,0 +1,19 @@
+Id: Python.Python
+Version: 3.8.5
+Name: Python
+Publisher: Python
+License: PSF LICENSE AGREEMENT FOR PYTHON
+LicenseUrl: https://docs.python.org/3/license.html
+AppMoniker: python
+Tags: python, python3
+Description: Python is a programming language that lets you work more quickly and integrate your systems more effectively.
+Homepage: https://www.python.org
+Installers:
+  - Arch: x64
+    Url: https://www.python.org/ftp/python/3.8.5/python-3.8.5-amd64.exe
+    Sha256: CD427C7B17337D7C13761CA20877D2D8BE661BD30415DDC17072A31A65A91B64
+    InstallerType: exe
+    Switches:
+      Silent: /Quiet
+      SilentWithProgress: /Passive
+      Custom: PrependPath=1