Initial data commit

Task/Bitmap-Histogram/Go/bitmap-histogram-1.go

@@ -0,0 +1,24 @@
+package raster
+
+import "math"
+
+func (g *Grmap) Histogram(bins int) []int {
+    if bins <= 0 {
+        bins = g.cols
+    }
+    h := make([]int, bins)
+    for _, p := range g.px {
+        h[int(p)*(bins-1)/math.MaxUint16]++
+    }
+    return h
+}
+
+func (g *Grmap) Threshold(t uint16) {
+    for i, p := range g.px {
+        if p < t {
+            g.px[i] = 0
+        } else {
+            g.px[i] = math.MaxUint16
+        }
+    }
+}