CLI: Implement category delete,show,list

cli.h

@@ -33,6 +33,9 @@ class CLIHandler
 	std::pair<bool, std::string> page_list(const std::vector<std::string> &args);
 	std::pair<bool, std::string> pageperms_set_permissions(const std::vector<std::string> &args);
 	std::pair<bool, std::string> version(const std::vector<std::string> &args);
+	std::pair<bool, std::string> category_list(const std::vector<std::string> &args);
+	std::pair<bool, std::string> category_delete(const std::vector<std::string> &args);
+	std::pair<bool, std::string> category_show(const std::vector<std::string> &args);
 
 	std::vector<struct cmd> cmds{
 		{{"user",
@@ -50,6 +53,13 @@ class CLIHandler
 		  1,
 		  {{{"list", "- lists existing pages", 0, {}, &CLIHandler::page_list}}},
 		  &CLIHandler::cli_help},
+		 {"category",
+		  "operation on categories",
+		  1,
+		  {{{"list", "- lists existing categories", 0, {}, &CLIHandler::category_list},
+			{"delete", " - deletes a category", 1, {}, &CLIHandler::category_delete},
+			{"show", " - shows pages of a category", 1, {}, &CLIHandler::category_show}}},
+		  &CLIHandler::cli_help},
 		 {"pageperms",
 		  "set permissions on pages",
 		  1,