add Uwe and Bart to CITATIONS.cff

.gitignore

@@ -1,3 +1,4 @@
 Manifest.toml
 .vscode/settings.json
+venv
 results/TUDELFT_V3_LEI_KITE/polars/$C_L$ vs $C_D$.pdf

CITATION.cff

@@ -7,6 +7,10 @@ authors:
   - family-names: "Poland"
     given-names: "Jelle Agatho Wilhelm"
     orcid: "https://orcid.org/0000-0003-3164-5648"
+  - family-names: "van de Lint"
+    given-names: "Bart"
+  - family-names: "Fechner"
+    given-names: "Uwe"
 title: "VortexStepMethod.jl"
 keywords:
   - Airborne Wind Energy, AWE, AWES, Vortex step methods

docs/developers.md

@@ -0,0 +1,19 @@
+## Notes for developers
+
+### How to check the .cff file
+
+You can validate the `CITATION.cff` file with the command:
+```bash
+cffconvert --validate
+```
+
+You can install the script `cffconvert` with the command:
+```bash
+python3 -m venv venv
+source venv/bin/activate
+python3 -m pip install cffconvert
+```
+After using the tool, deactivate the Python environment with:
+```bash
+deactivate
+```