Adding notebook example

See merge request !45

Resolve "Add a filter that is the minimum number of observations per grid cell to aggregate"

Closes #32

See merge request !44

Resolve "Update Gantt chart for 0.2"

Closes #66

See merge request !43

Resolve "Move plotting to a separate file and plotting object"

Closes #60

See merge request !42

updating time orig from hard coded value

See merge request !41

Resolve "Update of Logging"

Closes #38

See merge request !40

Resolve "Incorrect date in saved netcdf files"

Closes #64

See merge request !39

Update of readme

Closes #62

See merge request !38

Resolve "Update the Grids configuration"

See merge request !37

Resolve "Create test for process_data"

Closes #59

See merge request !35

Resolve "Change names of the methods"

See merge request !33

Resolve "DRY the code, remove duplicate functions that are used in both tropomi/viirs"

Closes #55

See merge request !32