Update and rename MMKG to MMKG.md

Author: heathersherry

topics/MMKG renamed to topics/MMKG.md

@@ -1,4 +1,4 @@
 ## Multi-Modal Knowledge Graph (MMKG)
-### Surveys and Paper Summary
+__Surveys and Paper Summary__
 1. Multi-Modal Knowledge Graph Construction and Application: A Survey [[Paper](https://arxiv.org/pdf/2202.05786.pdf)] [[Notes](https://mp.weixin.qq.com/s/5BzvtF-Ua2ty07iAjiRxcA)]'
 2. Awesome-Multimodal-Knowledge-Graph [[GitHub](https://github.com/ZihengZZH/awesome-multimodal-knowledge-graph)]