Add ISPRS template

[nikkopante]

https://www.isprs.org/documents/orangebook/app5.aspx

[rowanc1]

Hi @nikkopante,

We have done an initial push on this template, and it is working pretty well so far! You can use it with MyST documents using:

---
exports:
  - format: pdf
    template: isprs
---

Let us know how you get on! Closing this issue here and we can fine-tune the template here:

• https://github.com/myst-templates/isprs

Current options:

Screenshot of using this with this example:

[nikkopante]

Thank you @rowanc1 :) . Will share this to colleagues as well.