gpgv: add page (#4116)

pages/common/gpgv.md

@@ -0,0 +1,16 @@
+# gpgv
+
+> Verify OpenPGP signatures.
+> More information: <https://www.gnupg.org/documentation/manuals/gnupg/gpgv.html>.
+
+- Verify a signed file:
+
+`gpgv {{path/to/file}}`
+
+- Verify a signed file using a detached signature:
+
+`gpgv {{path/to/signature}} {{path/to/file}}`
+
+- Add a file to the list of keyrings (a single exported key also accounts as a keyring):
+
+`gpgv --keyring {{./alice.keyring}} {{path/to/file}} {{path/to/signature}}`