DOC: expand "using a Docker container" section
#### Location of the documentation

https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#using-a-docker-container
#### Documentation problem

Someone unfamiliar with Docker would be confused reading this.

#### Suggested fix for documentation

The expansion needed is quite small, just:

1. link to the Docker installation instructions
2. link to how to develop in a container using PyCharm (current docs only link to vs code instructions)
3. mention that you might still need to rebuild the C extensions if/when you merge with upstream/master with
   ```
   python setup.py build_ext --inplace -j 4
   ```