added example data for 2d grid collection stitching

...exercise_registration/2D_stitching/slide-10_c1m01_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m02_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m03_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m04_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m05_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m06_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m07_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m08_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m09_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m10_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m11_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m12_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m13_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m14_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m15_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m16_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m17_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m18_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m19_ORG.tif

...exercise_registration/2D_stitching/slide-10_c1m20_ORG.tif