tutorial 04: Add tutor notes

doc/tutorials/04-lattice_boltzmann/tutor_notes.md

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+# Part 2: Brownian motion of a sphere in a fluid
+
+## Physical learning goals
+
+* Learning the basics of Brownian motion
+* Getting a short introduction to the Flory theory of polymers
+* How to calculate the diffusion coefficient of a sphere
+
+## Espresso learning goals
+
+* Set up a LB fluid with particle coupling
+
+# Part 3: Brownian motion of a polymer in a fluid
+
+## Physical learning goals
+
+* Model the Brownian motion of a polymer
+* Learn about the hydrodynamic radius, radius of gyration, end-to-end distance
+* Reproduce theoretical results of the Flory theory of polymers
+* Using the Green-Kubo relation to calculate the diffusion coefficient of a polymer
+* Estimating the correlation-corrected standard error of the mean of a time series
+
+## Espresso learning goals
+
+* Using correlators