Add comprehensive LeetCode solutions index documentation

src/exercises/205.isomorphic-strings.py

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+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+
+# @leet imports end
+
+
+# @leet start
+class Solution:
+    def isIsomorphic(self, s: str, t: str) -> bool:
+        if len(s) != len(t):
+            return False
+        d = {}
+        for i in range(len(s)):
+            if s[i] not in d:
+                if t[i] in d.values():
+                    return False
+                d[s[i]] = t[i]
+            else:
+                if s[i] in d and d[s[i]] != t[i]:
+                    return False
+
+        return True
+# @leet end
+