Link blog post on TSDB queries in tsdb/README.md (#8391)

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

tsdb/README.md

@@ -16,4 +16,5 @@ A series of blog posts explaining different components of TSDB:
 * [The Head Block](https://ganeshvernekar.com/blog/prometheus-tsdb-the-head-block/)
 * [WAL and Checkpoint](https://ganeshvernekar.com/blog/prometheus-tsdb-wal-and-checkpoint/)
 * [Memory Mapping of Head Chunks from Disk](https://ganeshvernekar.com/blog/prometheus-tsdb-mmapping-head-chunks-from-disk/)
-* [Persistent Block and its Index](https://ganeshvernekar.com/blog/prometheus-tsdb-persistent-block-and-its-index/)
+* [Persistent Block and its Index](https://ganeshvernekar.com/blog/prometheus-tsdb-persistent-block-and-its-index/)
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+* [Queries](https://ganeshvernekar.com/blog/prometheus-tsdb-queries/)
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