CNCF Landscape enrichment in README (#4257)

* CNCF Landscape enrichment in README

* Shift order of chapters

just cla require

README.md

@@ -74,6 +74,16 @@ Contributions are warmly welcomed and greatly appreciated. And here are a few wa
 * Start by some [issues](https://github.com/vesoft-inc/nebula/issues)
 * Submit Pull Requests to us. See [how-to-contribute](https://docs.nebula-graph.io/master/15.contribution/how-to-contribute/).
 
+## Landscape
+
+<p align="left">
+<img src="https://landscape.cncf.io/images/left-logo.svg" width="150">&nbsp;&nbsp;<img src="https://landscape.cncf.io/images/right-logo.svg" width="200" />
+<br />
+
+[Nebula Graph](https://landscape.cncf.io/?selected=nebula-graph) enriches the <a href="https://landscape.cncf.io/card-mode?category=database&grouping=category">
+CNCF Database Landscape.</a>
+</p>
+
 ## Licensing
 
 **Nebula Graph** is under [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0) license, so you can freely download, modify, and deploy the source code to meet your needs. You can also freely deploy **Nebula Graph** as a back-end service to support your SaaS deployment.