Add project: ZnDraw - Visualization and Manipulation of Atomistic Data

[PythonFZ]

What kind of change does this PR introduce?

• Add a project
• Update a project
• Remove a project
• Add or update a category
• Change configuration
• Documentation
• Other, please describe:

Description:
Here I add the visualization tool ZnDraw (live demo at https://zndraw.icp.uni-stuttgart.de). It provides a webapp that can be installed and run locally via pip install zndraw or hosted for a shared experience.

Checklist:

• I have read the CONTRIBUTING guidelines.
• I have not modified the README.md file. Projects are only supposed to be added or updated within the projects.yaml file since the README.md file is automatically generated.

[Irratzo]

Remarks on my changes in a33f9e2.

• IPSuite
  • labels. removed 'community'. doesn't fit the description, imho. removed 'lang-py'. that's an implicit label. only projects that support languages other than Python benefit from it. removed 'active-learning'. yeah, best if all projects would have their category duplicated as label. but for now, we don't do that. added 'ml-iap'.
  • description. spelled out ML-IAP. 'MLP' commonly stands for multilayer perceptron.
• ZnDraw
  • labels. removed 'lang-py'. removed 'general-tool'. doesn't fit the description, imho. removed 'viz'. added 'md'.
  • description. took the one from the preprint. found it more descriptive. hope that's okay.