Adding ishtob keymap to master (#3235)

* Adding my personal planck keymap

* Adding readme.md to my keymap

keyboards/planck/keymaps/ishtob/rule.mk

@@ -0,0 +1,28 @@
+ifeq ($(strip $(SECRETS)),yes)
+	OPT_DEF += -DSECRETS
+endif
+
+# Build Options
+#   comment out to disable the options.
+#
+BACKLIGHT_ENABLE = no
+BOOTMAGIC_ENABLE = yes	# Virtual DIP switch configuration
+## (Note that for BOOTMAGIC on Teensy LC you have to use a custom .ld script.)
+MOUSEKEY_ENABLE = yes	# Mouse keys
+EXTRAKEY_ENABLE = yes	# Audio control and System control
+CONSOLE_ENABLE = yes	# Console for debug
+COMMAND_ENABLE = yes    # Commands for debug and configuration
+#SLEEP_LED_ENABLE = yes  # Breathing sleep LED during USB suspend
+NKRO_ENABLE = yes	    # USB Nkey Rollover
+CUSTOM_MATRIX = yes # Custom matrix file
+AUDIO_ENABLE = yes
+RGB_MATRIX_ENABLE = yes
+ENCODER_ENABLE = yes
+# SERIAL_LINK_ENABLE = yes
+
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
+
+ifndef QUANTUM_DIR
+	include ../../../../Makefile
+endif