Add figures to replace_linear_by_hashing.md

codes/go/chapter_searching/two_sum_test.go

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+// File: two_sum_test.go
+// Created Time: 2022-11-25
+// Author: reanon (793584285@qq.com)
+
+package chapter_searching
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestTwoSum(t *testing.T) {
+	// ======= Test Case =======
+	nums := []int{2, 7, 11, 15}
+	target := 13
+
+	// ====== Driver Code ======
+	// 方法一：暴力解法
+	res := twoSumBruteForce(nums, target)
+	fmt.Println("方法一 res =", res)
+	// 方法二：哈希表
+	res = twoSumHashTable(nums, target)
+	fmt.Println("方法二 res =", res)
+}