[Add] week-2 contents

Author: junnei

docs/leet-code/week-2/1.md

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+---
+sidebar_position: 1
+---
+
+# 0075-sort-colors
+#
+[**View Problem**](https://leetcode.com/problems/sort-colors)
+
+```python 0075-sort-colors
+print("Hello, World!")
+```

docs/leet-code/week-2/2.md

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+---
+sidebar_position: 2
+---
+
+# 0875-koko-eating-bananas
+#
+[**View Problem**](https://leetcode.com/problems/koko-eating-bananas)
+
+```python 0875-koko-eating-bananas
+print("Hello, World!")
+```

docs/leet-code/week-2/3.md

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+---
+sidebar_position: 3
+---
+
+# 0239-sliding-window-maximum
+#
+[**View Problem**](https://leetcode.com/problems/sliding-window-maximum)
+
+```python 0239-sliding-window-maximum
+print("Hello, World!")
+```