docs(dockerfiles/products): add product image download counts (#475)

Signed-off-by: wuhuizuo <[email protected]>

---------

Signed-off-by: wuhuizuo <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

dockerfiles/products/README.md

@@ -0,0 +1,21 @@
+Product container image Dockerfiles
+
+## Pull counts of product images
+
+| Image | Pulls |
+|-------|-------|
+| [pingcap/br](https://hub.docker.com/r/pingcap/br) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/br.svg) |
+| [pingcap/dm](https://hub.docker.com/r/pingcap/dm) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/dm.svg) |
+| [pingcap/dumpling](https://hub.docker.com/r/pingcap/dumpling) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/dumpling.svg) |
+| [pingcap/ng-monitoring](https://hub.docker.com/r/pingcap/ng-monitoring) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/ng-monitoring.svg) |
+| [pingcap/pd](https://hub.docker.com/r/pingcap/pd) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/pd.svg) |
+| [pingcap/ticdc](https://hub.docker.com/r/pingcap/ticdc) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/ticdc.svg) |
+| [pingcap/tidb](https://hub.docker.com/r/pingcap/tidb) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tidb.svg) |
+| [pingcap/tidb-binlog](https://hub.docker.com/r/pingcap/tidb-binlog) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tidb-binlog.svg) |
+| [pingcap/tidb-dashboard](https://hub.docker.com/r/pingcap/tidb-dashboard) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tidb-dashboard.svg) |
+| [pingcap/tidb-lightning](https://hub.docker.com/r/pingcap/tidb-lightning) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tidb-lightning.svg) |
+| [pingcap/tidb-operator](https://hub.docker.com/r/pingcap/tidb-operator) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tidb-operator.svg) |
+| [pingcap/tidb-tools](https://hub.docker.com/r/pingcap/tidb-tools) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tidb-tools.svg) |
+| [pingcap/tiflash](https://hub.docker.com/r/pingcap/tiflash) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tiflash.svg) |
+| [pingcap/tikv](https://hub.docker.com/r/pingcap/tikv) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tikv.svg) |
+| [pingcap/tiproxy](https://hub.docker.com/r/pingcap/tiproxy) | ![Docker Pulls](https://img.shields.io/docker/pulls/pingcap/tiproxy.svg) |