PR template for new PEtab problems (#154)

Author: dilpath

.github/PULL_REQUEST_TEMPLATE/new_petab_problem.md

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+# Checklist
+- [ ] Information about the model is in the SBML metadata
+    - [ ] Reference to the original publication, and any other relevant references
+    - [ ] A brief model description (one or two sentences)
+    - [ ] A brief description of the data (one or two sentences)
+    - [ ] Any differences between the implementation and the original publication
+- [ ] Information is in the model's GitHub issue
+    - [ ] Any differences between the implementation and the original publication
+    - [ ] Experience of fitting / uncertainty analysis (e.g. optimizer used, hyperparameters, reproducibility of best fit)
+    - [ ] Source of nominal parameters (e.g.: taken from the original publication, or from your own fitting)
+- [ ] PEtab files
+    - [ ] A "simulated data" measurement table is included, using the nominal parameters
+    - [ ] A visualization table is included, that can be used with the simulate data to reproduce figures from the original publication
+- [ ] I am assigned to the GitHub issue