[Keyboard] Add OSA keyboard (#6849)

* initial commit

restart of osa development

* minor changes

Minor changes
mostly changing naming and comment out rgb modes

* initial commit

restart of osa development

* minor changes

Minor changes
mostly changing naming and comment out rgb modes

* more minor changes

comment out some functions
correct some spelling errors
change some of the descriptive text

* Minor Changes

Minor changers per PR requests

* Minor Changes

Minor changes per PR suggestions

* Major Changes

Per PR suggestion from noroadsleft:

- changed macro to LAYOUT_all in info.json, dualsplit/keymap.c and ocm/keymap.c, and osa.h

- added osa.h macros for other layouts per suggestion and used suggested naming

-  changed naming of layout macros to correspond to macros and naming in default/keymap.c, dualsplit/keymap.c, ocm/keymap.c, splitbs/keymap.c, and splitrs/keymap.c

- removed duplicate layers from all keymaps and edited per suggestions

- compiled each keymap to check for and correct any potential errors. all compiled with no errors

* Minor Change

- fixed imgur image link in readme.md to be correct format

* Minor Changes

changes to macro layouts in osa.h
changes to dualsplit/keymap.c - added arrows to layer 1

* Changes

- Made changes to info.json to match osa.h
- changes to osa.c enabling indicator LEDs
- changed "dualsplit" directory name to "all" to match keymap naming in osa.h, info.json, and keymap.c
- minor changes to all/keymap.c

* Update keyboards/sck/osa/rules.mk

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Update keyboards/sck/osa/readme.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Changes to info.json

- revert to info.json from version in b3b49c3 per requested changes

keyboards/sck/osa/rules.mk

@@ -0,0 +1,37 @@
+# MCU name
+MCU = atmega32u4
+
+
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   ATmega32A    bootloadHID
+#   ATmega328P   USBasp
+BOOTLOADER = atmel-dfu
+
+
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite      # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = yes       # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
+CONSOLE_ENABLE = yes        # Console for debug(+400)
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = yes            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality on B7 by default
+RGBLIGHT_ENABLE = yes        # Enable keyboard RGB underglow
+MIDI_ENABLE = no            # MIDI support (+2400 to 4200, depending on config)
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = no           # Audio output on port C6
+FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
+HD44780_ENABLE = no 		# Enable support for HD44780 based LCDs (+400)