most static helpers up and running

nbody/checklist.md

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+# N-Body project - Checklist
+
+### Task 1
+- [ ] Compute characteristic quantities/scales
+- [x] Compare analytical model and particle density distribution
+- [ ] Compute forces through nbody simulation
+- [ ] vary softening length and compare results
+- [ ] compare with the analytical expectation from Newtons 2nd law
+- [ ] compute the relaxation time
+
+### Task 2