Add TDengine (#2249)

readme.md

@@ -695,6 +695,7 @@
 - [Database Tools](https://github.com/mgramin/awesome-db-tools#readme) - Everything that makes working with databases easier.
 - [TypeDB](https://github.com/vaticle/typedb-awesome#readme) - Logical database to organize large and complex networks of data as one body of knowledge.
 - [Cassandra](https://github.com/Anant/awesome-cassandra#readme) - Open-source, distributed, wide column store, NoSQL database management system.
+- [TDengine](https://github.com/taosdata/awesome-tdengine#readme) - An open-source time-series database with high-performance, scalability, and SQL support.
 
 ## Media