[Keyboard] Added two handwired keyboards (#11696)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/handwired/oem_iso_fullsize/readme.md

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+# oem_iso_fullsize
+
+![top view](https://i.imgur.com/Pm5Vz1P.jpg)
+
+I handwired a Gamdias 7 Colors that had a dead PCB and manage to revive it with a teensy
+
+* Keyboard Maintainer: [Andres Teare](https://github.com/andresteare)
+* Hardware Supported: Teensy++ 2.0
+* Hardware Availability: got the teensy from aliexpress
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/oem_iso_fullsize:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+I didn't manage to make backlighting to work properly, because it looks like I need a LED driver, but if you have this keyboard and already have an LED driver, here are the respective resistor you need to wire to the teensy 
+*Row 0, resistor R132, Pin A1
+*Row 1, R131, Pin B5
+*Row 2, R130, Pin E4
+*Row 3, R129, Pin A2
+*Row 4, R128, Pin E5
+*Row 5, R127, Pin A7
+
+These line are specifically to my pinout so it's probably not essencial for you
+#define DIODE_DIRECTION ROW2COL
+#define LED_CAPS_LOCK_PIN C7
+#define LED_SCROLL_LOCK_PIN A3
+#define LED_NUM_LOCK_PIN C6
+#define BACKLIGHT_PINS { B5, E5, E4, A7, A1, A2 }
+#define BACKLIGHT_LEVELS 1