CLI: Add 'version' command

cli.cpp

@@ -8,6 +8,7 @@
 #include "authenticator.h"
 #include "config.h"
 #include "logger.h"
+#include "version.h"
 
 CLIHandler::CLIHandler(Config &config, Database &db)
 {
@@ -218,3 +219,8 @@ std::pair<std::string, std::vector<std::string>> CLIHandler::splitCommand(std::s
 	splitted.erase(splitted.begin());
 	return {cmd, splitted};
 }
+
+std::pair<bool, std::string> CLIHandler::version(const std::vector<std::string> &args)
+{
+	return {true, get_version_string()};
+}