feat: documentation

advection/src/AdvectionKernel.h

@@ -7,8 +7,19 @@
 
 #define DT 50
 
+/*
+ * Implement this class for every integration method.
+ */
 class AdvectionKernel {
 public:
+    /**
+     * This function must take a time, latitude and longitude of a particle and must output
+     * a new latitude and longitude after being advected once for DT time as defined above.
+     * @param time Time since the beginning of the data
+     * @param latitude Latitude of particle
+     * @param longitude Longitude of particle
+     * @return A pair of latitude and longitude of particle.
+     */
     virtual std::pair<double, double> advect(int time, double latitude, double longitude) const = 0;
 };