Add NEWS.md

Author: timholy

NEWS.md

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+# NEWS
+
+Release ??:
+- The transition to ImageCore 0.9 has an important implication for thresholds in some algorithms: RGB distances are now effectively
+  measured at `1/sqrt(3)` of their former size, due to the new consistency between `abs2(g::Gray)` and `abs2(RGB(g::Gray))`.
+- Output types use `floattype` in more places. In some cases this has resulted in `RGB{Float32}` rather than `RGB{Float64}` outputs.
+- New `flood` and `flood_fill!` algorithms allow segmenting just the portion of the image connected to a seed point.
+- `seeded_region_growing` now allows seeds to be supplied with pair syntax, e.g.,
+  `[CartesianIndex(300,97) => 1, CartesianIndex(145,218) => 2]`.
+- Kernel/window dimensions supplied in vector format are deprecated. Instead of supplying the neighborhood size as `[3,3]`, use `(3, 3)` (`seeded_region_growing` and `unseeded_region_growing`).
+- `felzenswalb` now supports multidimensional images.