[Keyboard] New kbd 1k (#15509)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: mtei <2170248+mtei@users.noreply.github.com>
Co-authored-by: Nick Brassel <nick@tzarc.org>

keyboards/1k/rules.mk

@@ -0,0 +1,26 @@
+# MCU name
+MCU = attiny85
+
+# Bootloader selection
+BOOTLOADER = custom
+BOOTLOADER_SIZE = 1862
+PROGRAM_CMD = micronucleus --run $(BUILD_DIR)/$(TARGET).hex
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = no        # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+
+# Save as much space as we can...
+LTO_ENABLE = yes
+GRAVE_ESC_ENABLE = no
+MAGIC_ENABLE = no
+SPACE_CADET_ENABLE = no