qemu-img: add page (#1074)

pages/common/qemu-img.md

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+# qemu-img
+
+> Tool for Quick Emulator Virtual HDD image creation and manipulation.
+
+- Create disk image with a specific size (in gigabytes):
+
+`qemu-img create {{image_name.img}} {{gigabites}}G`
+
+- Show information about a disk image:
+
+`qemu-img info {{image_name.img}}`
+
+- Increase or decrease image size:
+
+`qemu-img resize {{image_name.img}} {{gigabites}}G`
+
+- Dump the allocation state of every sector of the specified disk image:
+
+`qemu-img map {{image_name.img}}`