Add Python v3.8.7 (#5806)

manifests/Python/Python/3.8.7.yaml

@@ -0,0 +1,21 @@
+  
+Id: Python.Python
+Version: 3.8.7
+Name: Python
+Publisher: Python
+License: PSF LICENSE AGREEMENT FOR PYTHON
+LicenseUrl: https://docs.python.org/3/license.html
+AppMoniker: python
+Tags: python, python3, programming language, script, glue language
+FileExtensions: py,pyw,pyc,pyo
+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/3.8.7/python-3.8.7-amd64.exe
+    Sha256: B8D539D67A9C97A1ACC30DC871821D140C383F160D8A1CD3B5A1A5A0D351AF68 
+    InstallerType: exe
+    Switches:
+      Silent: /Quiet
+      SilentWithProgress: /Passive
+      Custom: PrependPath=1