Add instructions to udev rules file, and fix order

Adding the instructions is useful for linking to the file from elsewhere

Order fix supercedes #199

Author: will-v-pi

README.md

@@ -30,7 +30,7 @@ make
 On Linux you can add udev rules in order to run picotool without sudo:
 
 ```console
-sudo cp udev/99-picotool.rules /etc/udev/rules.d/
+sudo cp udev/60-picotool.rules /etc/udev/rules.d/
 ```
 
 ### Windows

bazel/README.md

@@ -17,7 +17,7 @@ sudo apt install build-essential libudev-dev
 On Linux you can add udev rules in order to run picotool without sudo:
 
 ```console
-sudo cp udev/99-picotool.rules /etc/udev/rules.d/
+sudo cp udev/60-picotool.rules /etc/udev/rules.d/
 ```
 
 ### macOS

udev/99-picotool.rules renamed to udev/60-picotool.rules

@@ -1,3 +1,6 @@
+# Copy this file to /etc/udev/rules.d/
+# You can reload the udev rules with "udevadm control --reload"
+
 SUBSYSTEM=="usb", \
     ATTRS{idVendor}=="2e8a", \
     ATTRS{idProduct}=="0003", \