kwallet-query: add page (#15162)

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/linux/kwallet-query.md

@@ -0,0 +1,16 @@
+# kwallet-query
+
+> Read and write to a KDE Wallet.
+> More information: <https://manned.org/kwallet-query>.
+
+- List all entries in the `Passwords` folder of `kdewallet`:
+
+`kwallet-query {{kdewallet}} {{-l|--list-entries}}`
+
+- List all entries in a specific folder:
+
+`kwallet-query {{kdewallet}} {{-l|--list-entries}} {{-f|--folder}} {{folder_name}}`
+
+- List all available folders:
+
+`kwallet-query  {{kdewallet}} {{-l|--list-entries}} {{-f|--folder}} ""`