Add the initial EN translation for C++ code (#1346)

en/codes/cpp/chapter_dynamic_programming/climbing_stairs_dfs.cpp

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+/**
+ * File: climbing_stairs_dfs.cpp
+ * Created Time: 2023-06-30
+ * Author: krahets (krahets@163.com)
+ */
+
+#include "../utils/common.hpp"
+
+/* Search */
+int dfs(int i) {
+    // Known dp[1] and dp[2], return them
+    if (i == 1 || i == 2)
+        return i;
+    // dp[i] = dp[i-1] + dp[i-2]
+    int count = dfs(i - 1) + dfs(i - 2);
+    return count;
+}
+
+/* Climbing stairs: Search */
+int climbingStairsDFS(int n) {
+    return dfs(n);
+}
+
+/* Driver Code */
+int main() {
+    int n = 9;
+
+    int res = climbingStairsDFS(n);
+    cout << "There are " << res << " solutions to climb " << n << " stairs" << endl;
+
+    return 0;
+}