🗃️ Add component "ChemTensor" from Issue #157

[github-actions]

Closes #157. This PR was automatically generated.

---

Summary:

title: ChemTensor
languages:
  - C
  - Python
links:
  docs: https://chemtensor.readthedocs.io
  github: https://github.com/qc-tum/chemtensor
  releases: https://pypi.org/project/chemtensor/
maintainers:
  - TUM-QC
---

**ChemTensor** is a implementation of tensor network algorithms tailored for chemical systems. It is written in C, offering a Python 3 interface for more straightforward accessibility.

Features include representation of common Hamiltonians as MPOs (including molecular Hamiltonians), tree tensor network topologies, general MPO and TTNO construction with optimized bond dimensions from a list of operator chains, U(1) and SU(2) symmetries, single- and two-site DMRG algorithm, tensor hypercontraction form of molecular Hamiltonians, Basis-Update and Galerkin (BUG) rank-adaptive time integration.

[github-actions]

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