feat: add go solution to lc problem: No.0048 (#838)

No.0048.Rotate Image

Author: poltao

solution/0000-0099/0048.Rotate Image/README.md

@@ -192,6 +192,25 @@ impl Solution {
 }
 ```
 
+### **Go**
+
+```go
+func rotate(matrix [][]int) {
+	n := len(matrix)
+	for i := 0; i < n; i++ {
+		for j := i; j < n; j++ {
+			matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]
+		}
+	}
+	
+	for i := 0; i < n; i++ {
+		for j, k := 0, n-1; j < k; j, k = j+1, k-1 {
+			matrix[i][j], matrix[i][k] = matrix[i][k], matrix[i][j]
+		}
+	}
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0048.Rotate Image/README_EN.md

@@ -178,6 +178,26 @@ impl Solution {
 }
 ```
 
+### **Go**
+
+```go
+func rotate(matrix [][]int) {
+	n := len(matrix)
+	// matrix transpose
+	for i := 0; i < n; i++ {
+		for j := i; j < n; j++ {
+			matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]
+		}
+	}
+	// reverse each matrix[i]
+	for i := 0; i < n; i++ {
+		for j, k := 0, n-1; j < k; j, k = j+1, k-1 {
+			matrix[i][j], matrix[i][k] = matrix[i][k], matrix[i][j]
+		}
+	}
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0048.Rotate Image/Solution.go

@@ -0,0 +1,15 @@
+func rotate(matrix [][]int) {
+	n := len(matrix)
+	// matrix transpose
+	for i := 0; i < n; i++ {
+		for j := i; j < n; j++ {
+			matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]
+		}
+	}
+	// reverse each matrix[i]
+	for i := 0; i < n; i++ {
+		for j, k := 0, n-1; j < k; j, k = j+1, k-1 {
+			matrix[i][j], matrix[i][k] = matrix[i][k], matrix[i][j]
+		}
+	}
+}