Add CodeTriage badge to pandas-dev/pandas

Adds a badge showing the number of people helping this repo on CodeTriage.

[![Open Source Helpers](https://www.codetriage.com/pandas-dev/pandas/badges/users.svg)](https://www.codetriage.com/pandas-dev/pandas)

## What is CodeTriage?

CodeTriage is an Open Source app that is designed to make contributing to Open Source projects easier. It works by sending subscribers a few open issues in their inbox. If subscribers get busy, there is an algorithm that backs off issue load so they do not get overwhelmed

[Read more about the CodeTriage project](https://www.codetriage.com/what).

## Why am I getting this PR?

Your project was picked by the human, @schneems. They selected it from the projects submitted to https://www.codetriage.com and hand edited the PR. How did your project get added to [CodeTriage](https://www.codetriage.com/what)? Roughly about 1 year ago, [vinayaugustine](https://github.com/vinayaugustine) added this project to CodeTriage in order to start contributing. Since then, 207 people have subscribed to help this repo.

## What does adding a badge accomplish?

Adding a badge invites people to help contribute to your project. It also lets developers know that others are invested in the longterm success and maintainability of the project.

You can see an example of a CodeTriage badge on these popular OSS READMEs:

- [![Email clients like GMAIL do not render SVG images](https://www.codetriage.com/rails/rails/badges/users.svg)](https://www.codetriage.com/rails/rails) https://github.com/rails/rails
- [![Email clients like GMAIL do not render SVG images](https://www.codetriage.com/crystal-lang/crystal/badges/users.svg)](https://www.codetriage.com/crystal-lang/crystal) https://github.com/crystal-lang/crystal

## Have a question or comment?

While I am a bot, this PR was manually reviewed and monitored by a human - @schneems. My job is writing commit messages and handling PR logistics.

If you have any questions, you can reply back to this PR and they will be answered by @schneems. If you do not want a badge right now, no worries, close the PR, you will not hear from me again.

Thanks for making your project Open Source! Any feedback is greatly appreciated.

Author: codetriage-readme-bot

Diff for: README.md

@@ -216,13 +216,16 @@ Further, general questions and discussions can also take place on the [pydata ma
 ## Discussion and Development
 Most development discussion is taking place on github in this repo. Further, the [pandas-dev mailing list](https://mail.python.org/mailman/listinfo/pandas-dev) can also be used for specialized discussions or design issues, and a [Gitter channel](https://gitter.im/pydata/pandas) is available for quick development related questions.
 
-## Contributing to pandas
+## Contributing to pandas [![Open Source Helpers](https://www.codetriage.com/pandas-dev/pandas/badges/users.svg)](https://www.codetriage.com/pandas-dev/pandas)
+
 All contributions, bug reports, bug fixes, documentation improvements, enhancements and ideas are welcome.
 
 A detailed overview on how to contribute can be found in the **[contributing guide.](https://pandas.pydata.org/pandas-docs/stable/contributing.html)**
 
 If you are simply looking to start working with the pandas codebase, navigate to the [GitHub “issues” tab](https://github.com/pandas-dev/pandas/issues) and start looking through interesting issues. There are a number of issues listed under [Docs](https://github.com/pandas-dev/pandas/issues?labels=Docs&sort=updated&state=open) and [Difficulty Novice](https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+label%3A%22Difficulty+Novice%22) where you could start out.
 
+You can also triage issues which may include reproducing bug reports, or asking for vital information such as version numbers or reproduction instructions. If you would like to start triaging issues, one easy way to get started is to [subscribe to pandas on CodeTriage](https://www.codetriage.com/pandas-dev/pandas).
+
 Or maybe through using pandas you have an idea of your own or are looking for something in the documentation and thinking ‘this can be improved’...you can do something about it!
 
 Feel free to ask questions on the [mailing list](https://groups.google.com/forum/?fromgroups#!forum/pydata) or on [Gitter](https://gitter.im/pydata/pandas).