Add new study: Collette_2021

[ehwenk]

• add large study looking at seed dormancy
• data from online repository; authors have not yet responded to email

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f4c7bb4) 80.20% compared to head (0c467f0) 80.20%.

:exclamation: Current head 0c467f0 differs from pull request most recent head 00f1ae7. Consider uploading reports for the commit 00f1ae7 to get more accurate results

:exclamation: Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #717 +/- ## ======================================== Coverage 80.20% 80.20% ======================================== Files 7 7 Lines 1531 1531 ======================================== Hits 1228 1228 Misses 303 303 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.