add test for mermaid

Author: guFalcon

md/test-md-file.md

@@ -31,6 +31,15 @@ Mama -> Günter
 Gerald -> Mama
 Günter -> Gerald
 ```
+## Test Mermaid
+```mermaid
+flowchart TD
+	A[Christmas] -->|Get money| B(Go shopping)
+	B --> C{Let me think}
+	C -->|One| D[Laptop]
+	C -->|Two| E[iPhone]
+	C -->|Three| F[fa:fa-car Car]
+```
 
 ## Test Code Tags
 ```java