Update mermaid.md

Author: showipintbri

docs/mermaid.md

@@ -1,5 +1,10 @@
 # mm test
 
 ```mermaid
-A ---> B
+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]
 ```