[#3005] feat(leetcode): init project, add C# solution

problems/3005-count_elements_with_maximum_frequency/test/main_test.go

@@ -0,0 +1,12 @@
+// LeetCode 3005 單元測試（Go testing）
+package main
+
+import "testing"
+
+func TestExample(t *testing.T) {
+    // TODO: input := []int{}
+    // got := solve(input)
+    // want := 0
+    // if got != want { t.Fatalf("want %v got %v", want, got) }
+}
+