Added more disk images for the PDP-11

disks/dec/rl01k/README.md

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+---
+layout: page
+title: DEC RL01K Disk Images
+permalink: /disks/dec/rl01k/
+---
+
+DEC RL01K Disk Images
+---------------------
+
+RL01K disks are single-platter cartridges with 256 tracks per side, 40 sectors per track, and a sector size of
+256 bytes, for a total capacity of 5Mb (5,242,880 bytes).  They are used in RL01 disk drives in conjunction
+with an [RL11 Disk Controller](/devices/pdp11/rl11/).
+
+* [RSTS/E v7.0](rstsev70/) [[Source](http://skn.noip.me/pdp11/): RL2.DSK]

disks/dec/rl01k/rstsev70/README.md

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+---
+layout: page
+title: "RL01K RSTS/E v7.0 Disk"
+permalink: /disks/dec/rl01k/rstsev70/
+---
+
+RL01K RSTS/E v7.0 Disk
+----------------------
+
+### Boot
+
+To boot the RL01K "RSTS/E v7.0" disk, start a [PDP-11/70](/devices/pdp11/machine/1170/panel/debugger/) with an
+[RL11 Disk Controller](/devices/pdp11/rl11/), select the "RSTS/E v7.0" disk from the list of disks
+available for drive "RL0", click **Load**, and wait for the message:
+
+	Mounted disk "RSTS/E v7.0" in drive RL0
+
+Then start the machine (click **Run**) and make sure the following prompt has been displayed:
+
+	PDP-11 MONITOR V1.0
+	
+	BOOT>
+
+At the prompt, type "BOOT RL0".