GIMP 2.10.18 (#31)

* Create 2.10.18.yaml

* Update 2.10.18.yaml

manifests/GIMP/GIMP/2.10.18.yaml

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+Id: gimp.gimp
+Name: GIMP
+AppMoniker: gimp
+Version: 2.10.18
+Publisher: gimp
+Author: gimp
+License: Copyright (C) 2007 Free Software Foundation, Inc. - GNU General Public License
+LicenseUrl: https://www.gimp.org/about/COPYING
+MinOSVersion: 10.0.0.0
+Homepage: https://www.gimp.org
+Description: GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.
+Tags: "editor,image,picture,pictures,photo,gimp"
+InstallerType: Inno
+Installers: 
+  - Arch: x64 
+    Url: https://download.gimp.org/mirror/pub/gimp/v2.10/windows/gimp-2.10.18-setup-2.exe
+    Sha256: BF6CE59587E63E1E8BAB923E7DFDAA0F2C8BD3AC4D0CED602F3C063F9E32465C
+    Switches: 
+      Silent: "/VERYSILENT /NORESTART /ALLUSERS"
+      SilentWithProgress: "/VERYSILENT /NORESTART /ALLUSERS"