Meridian LED update (#15329)

* Meridian first update

* Update README, adjust timing settings

* Update README

1 files changed, 22 insertions, 2 deletions

diff --git a/keyboards/primekb/meridian/readme.md b/keyboards/primekb/meridian/readme.md
index 0e3339a597..01df9c5ba3 100644
--- a/keyboards/primekb/meridian/readme.md
+++ b/keyboards/primekb/meridian/readme.md
@@ -5,8 +5,28 @@
 * Keyboard Maintainer: [Holten Campbell](https://github.com/holtenc)
 * Hardware Supported: STM32F072CBT6
 
-Make example for this keyboard (after setting up your build environment):
+## Compiling firmware and flashing
 
-    make primekb/meridian:default
+### Enter bootloader
+
+The DFU state in the bootloader can be accessed in 3 ways:
+
+* **Bootmagic reset**: hold down the key at (0,0) in the matrix (usually Escape) and plug in the keyboard; or
+* **Physical reset button**: press the button on the bottom of the PCB; or
+* **Keycode in layout**: press the key mapped to `RESET` if it is available (Escape key on layer 1 in the default layout).
+
+### Compile firmware
+
+The Meridian PCB was delivered in two variants, equal in design but using different RGB LED models: one using WS2812 and another using KTR1010 LEDs. Both can be compiled using
+
+    make primekb/meridian/ws1812:default
+    make primekb/meridian/ktr1010:default
+
+After compiling, enter bootloader in the PCB and flash the firmware using `dfu-util` or QMK Toolbox. For direct compile-and-flashing, put the PCB in DFU state and use
+
+    make primekb/meridian/ws1812:default:flash
+    make primekb/meridian/ktr1010:default:flash
+
+VIA-supported firmwares are also available.
 
 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).