add SAGA GIS (#6957)

* add SAGA GIS

* add SAGA - improved

second installer removed

* fixed user input

based on recomendaton from Kevin. It works as expeted now

manifests/SAGAUserGroupAssociation/SAGAGIS/7.9.0.0.yaml

@@ -0,0 +1,19 @@
+Id: SAGAUserGroupAssociation.SAGAGIS
+Publisher: SAGA User Group Association
+Name: SAGA GIS
+Version: 7.9.0.0
+License: GNU General Public Licence or GPL
+InstallerType: Inno
+LicenseUrl: http://www.gnu.org/licenses/gpl-3.0.html
+AppMoniker: SAGA
+Tags: GIS; geography; topography; science
+Description: SAGA is the abbreviation for System for Automated Geoscientific Analyses.
+Homepage: http://www.saga-gis.org/en/index.html
+Installers:
+  - Arch: x64
+    InstallerType: Inno
+    Url: https://sourceforge.net/projects/saga-gis/files/SAGA%20-%207/SAGA%20-%207.9.0/saga-7.9.0_x64_setup.exe
+    Sha256: B6CCA9BC3F5C8F39EE8C4C2472AA3A9E1967228484412F272E197935F1C7B758
+    Language: EN
+    Silent: 
+# Generated by https://github.com/ptorr-msft/WinGetYamlGenerator