Add page for bmaptool.

pages/common/bmaptool.md

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+# bmaptool
+
+> Create or Copy blockmaps intelligently (and therefore faster than `cp` or `dd`).
+
+- Create a blockmap from image file.
+
+`bmaptool create -o {{blockmap.bmap}} {{source.img}}`
+
+- Copy an image file into sdb.
+
+`bmaptool copy --bmap {{blockmap.bmap}} {{source.img}} {{/dev/sdb}}`
+
+- Copy a compressed image file into sdb.
+
+`bmaptool copy --bmap {{blockmap.bmap}} {{source.img.gz}} {{/dev/sdb}}`
+
+- Copy an image file into sdb without using a blockmap.
+
+`bmaptool copy --nobmap {{source.img}} {{/dev/sdb}}`