naming section in README.md

README.md

@@ -9,3 +9,10 @@ In each solution I always aim for the lowest
 possible time complexity first; however, there
 may be multiple solutions for some problems to
 try to minimise space complexity instead.
+
+## Naming
+Each folder is the name of the problem from its URL,
+so the problem can be accessed at:
+```
+https://leetcode.com/problems/<folder-name>/
+```