[Add] docs for week4

Author: junnei

Diff for: docs/leet-code/week-4/1.md

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+---
+sidebar_position: 1
+---
+
+# 0232-implement-queue-using-stacks
+#
+[**View Problem**](https://leetcode.com/problems/implement-queue-using-stacks)
+
+```python 0232-implement-queue-using-stacks
+import random
+
+sizes = [100, 1000, 10000, 100000]
+datas = [
+    [random.randint(30, 100) for i in range(size)]
+    for size in sizes
+]
+func_name = "dailyTemperatures"
+```

Diff for: docs/leet-code/week-4/2.md

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+---
+sidebar_position: 2
+---
+
+# 0215-kth-largest-element-in-an-array
+#
+[**View Problem**](https://leetcode.com/problems/kth-largest-element-in-an-array)
+
+```python 0215-kth-largest-element-in-an-array
+import random
+
+elem = ["."] + [str(i) for i in range(1, 10)]
+sizes = [1]
+datas = [
+    [
+        [elem[random.randint(0, 9)] for _ in range(9)]
+        for _ in range(9)
+    ]
+]
+
+func_name = "findKthLargest"
+```

Diff for: docs/leet-code/week-4/3.md

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+---
+sidebar_position: 3
+---
+
+# 0057-insert-interval
+#
+[**View Problem**](https://leetcode.com/problems/insert-interval)
+
+```python 0057-insert-interval
+sizes = [3]
+datas = [
+    ["eat","tea","tan","ate","nat","bat"],
+    [""],
+    ["a"]
+]
+
+func_name = "insert"
+```

Diff for: docs/leet-code/week-4/_category_.json

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+{
+  "position": 4,
+  "label": "Week 4",
+  "collapsible": true,
+  "collapsed": true
+}

Diff for: docs/leet-code/week-4/index.md

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+---
+sidebar_position: 400
+---
+
+# Week 4
+
+Week 4. Queue / Heap / Priority Queue / Greedy / Interval