added command "list" (so far without -status)

cli/parser.cpp

@@ -10,7 +10,7 @@ using namespace std;
 
 void show_usage() {
     cout << "usage:\n" 
-            "these env vars have to be set: FRONTEND_API_KEY, DB_URL"
+            "these env vars have to be set: FRONTEND_API_KEY, BASE_API_URL\n"
             "tickets create <title> <description>\n"
             "tickets list [-status <status>]\n"
             "tickets detail <id>" << endl;
@@ -33,7 +33,7 @@ int parse_args(Dao *dao, int argc, char *argv[]) {
 
 
     if (strcmp(argv[1], "list") == 0) { // listing tickets (optional filter by status)
-        if (argc != 2 || argc != 4) {
+        if (argc != 2 && argc != 4) {
             show_usage_and_die();
         }