buildMosaic: Bluid Mosaic Function
In IFGI-Project/LandTendR-Package: LandTrendR Algorithm in R

This function creates a mosaic from ee.Image

1	buildMosaic(year, startDay, endDay, aoi, dummyCollection)

`year`	this parameter is automatically and refers to each year from Start Year and End Year
`startDay`	String variable - date tie to the Starting year (Default: '06-01')
`endDay`	String variable - date tie to the Ending year (Default: '09-30')
`aoi`	this parameter refers Area Of Interest and constrain the retrieve images to the AOI.
`dummyCollection`	empty ee.ImageCollection filled with zeros