Added status table for bloom releases of ros2/rclc repo - #253

Has anyone an idea, how to merge multiple rows for "Architecture" in a markdown table like

| Package | Release |      Architecture          |
|         |         | amd64   | arm64  |  armhf  |

I tried with

|             |          Grouping           ||

https://stackoverflow.com/questions/46621765/can-i-merge-table-rows-in-markdown

and

| Span <td colspan=3>triple  <td colspan=2>double

https://stackoverflow.com/questions/23571724/github-markdown-colspan

Both approaches did not work.

@JanStaschulat , you can try generating the sub-table with markdown, then convert it to html code
using this, for example, finally embed the resulting html into the markdown outer cell. See this.

@jamoralp thanks for the trick. I'd rather keep the table in markdown. It is already quite a number of links. If you are fine with the table as is, could you approve and merge the PR?

updated REAMDE in micro-ros/rclc
micro-ROS/rclc#60