Added device specs

README.md

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+# Firmware for BigTree Bluer
+Clean Marlin with support for installed motors and BLTouch
+
+## Printer hardware
+### Drivers:
+1. X-Axis: `TMC2209-LA`
+2. Y-Axis: `TMC2209-LA`
+3. Z-Axis: `TMC2225-SA`
+4. Extruder: `TMC2225-SA`
+
+### BLTouch:
+Based on that project: https://www.thingiverse.com/thing:4611997
+
+```c
+#define Z_MIN_PROBE_ENDSTOP_INVERTING false
+#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
+#define BLTOUCH
+#define Z_SAFE_HOMING
+#define AUTO_BED_LEVELING_BILINEAR
+
+#define NOZZLE_TO_PROBE_OFFSET { 40, -0.7, 0 }  # For the right version.
+#define NOZZLE_TO_PROBE_OFFSET { -40, -0.7, 0 } # For the left version.
+
+#define GRID_MAX_POINTS_X 4
+#define LCD_BED_LEVELING
+```