dist: Add missing files

The dist zipfile we were generating didn't include the recovery image or the
README our prior build system generated through additional scripting.

Change-Id: I329d6a552e295e0e459050ff5eb93817df103d0f
diff --git a/README b/README
new file mode 100644
index 0000000..a075416
--- /dev/null
+++ b/README
@@ -0,0 +1,15 @@
+These files are required to flash the Mendel Linux OS to an attached device
+using fastboot:
+1. On your host computer, install the `fastboot` tool.
+2. Using either the serial console or the `fastboot` tool, put the device into
+   fastboot mode.
+3. Connect to the device using a USB cable, attached to the device's USB data
+   "OTG" port.
+4. Run the `flash.sh` script in this directory.
+For detailed instructions, visit g.co/coral/setup
+Note: The recovery.img file is just the U-Boot image. Use that to recover a
+failing device by flashing it to an SD card and booting from that (also follow
+the previous link for details).
diff --git a/dist.mk b/dist.mk
index 4b47f88..78880dd 100644
--- a/dist.mk
+++ b/dist.mk
@@ -30,9 +30,11 @@
 	$(PRODUCT_OUT)/partition-table-64gb.img \
 	$(PRODUCT_OUT)/partition-table-16gb.img \
 	$(PRODUCT_OUT)/partition-table-8gb.img \
+	$(PRODUCT_OUT)/recovery.img \
 	$(PRODUCT_OUT)/rootfs_arm64.img \
 	$(PRODUCT_OUT)/u-boot.imx \
-	$(ROOTDIR)/board/flash.sh
+	$(ROOTDIR)/board/flash.sh \
 package-images: $(DIST_ZIPNAME)
 sign-images: $(DIST_SHA256NAME)