Document coupling experiments on the perpendicular-flap tutorial (#692)

Links to the VKI training talk.

Closes precice/precice.github.io#265

Author: MakisH

perpendicular-flap/README.md

@@ -122,6 +122,11 @@ In this case, the coupling between the fluid flow and the flap becomes stronger
 
 With the default value of $$ \rho_s= 3.0·10^{3}kg/m^{3} $$, the simulation will also converge with an explicit coupling scheme. With $$ \rho_s= 1kg/m^{3} $$, the simulation will only converge with implicit coupling, with an acceleration method such as the IQN-ILS in the current configuration.
 
+See [how this tutorial behaves with different coupling algorithms](https://makish.github.io/vki-training/#/17).
+This talk varies the [coupling scheme configuration](https://precice.org/configuration-coupling.html) and demonstrates explicit and implicit coupling schemes, the latter with constant, Aitken, and Anderson acceleration.
+Even though this is not a rigorous study, it demonstrates the effect that different coupling algorithms can have.
+Find more thorough studies in the [literature guide](https://precice.org/fundamentals-literature-guide.html#precice-features).
+
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