gacutil: add page (#7898)

* Add gacutil

* Add the abbreviation to description

Co-authored-by: Jakob Miksch <info@jakobmiksch.eu>

* Simplify man page url

Co-authored-by: Muhammad Falak R Wani <falakreyaz@gmail.com>

Co-authored-by: Jakob Miksch <info@jakobmiksch.eu>
Co-authored-by: Muhammad Falak R Wani <falakreyaz@gmail.com>

pages/common/gacutil.md

@@ -0,0 +1,16 @@
+# gacutil
+
+> Global Assembly Cache (CAG) management utility.
+> More information: <https://manned.org/gacutil>.
+
+- Install the specified assembly into GAC:
+
+`gacutil -i {{path/to/assembly.dll}}`
+
+- Uninstall the specified assembly from GAC:
+
+`gacutil -i {{assembly_display_name}}`
+
+- Print the content of GAC:
+
+`gacutil -l`