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adding back file with correct case of letters in the file type.

config/boards/shields/48Key/48Key.overlay

@@ -0,0 +1,45 @@
+#include <dt-bindings/zmk/matrix_transform.h>
+
+/ {
+    chosen {
+        zmk,kscan = &default_kscan;
+        zmk,matrix_transform = &default_transform;
+    };
+
+    default_kscan: kscan {
+        compatible = "zmk,kscan-gpio-matrix";
+        label = "default_kscan";
+        diode-direction = "col2row";
+
+        row-gpios = <&pro_micro 6 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>,
+                    <&pro_micro 19 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>,
+                    <&pro_micro 7 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>,
+                    <&pro_micro 20 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
+
+        col-gpios = <&pro_micro 26 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 25 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 24 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 23 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 22 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 21 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 8 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 9 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 10 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 11 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 12 GPIO_ACTIVE_HIGH>,
+                    <&pro_micro 13 GPIO_ACTIVE_HIGH>,
+    };
+
+    default_transform: matrix_transform {
+        compatible = "zmk,matrix-transform";
+        rows = <4>;
+        columns: <12>;
+
+        map = <
+            RC(0,0) RC(0,1) RC(0,2) RC(0,3) RC(0,4) RC(0,5)  RC(0,6) RC(0,7) RC(0,8) RC(0,9) RC(0,10) RC(0,11)
+            RC(1,0) RC(1,1) RC(1,2) RC(1,3) RC(1,4) RC(1,5)  RC(1,6) RC(1,7) RC(1,8) RC(1,9) RC(1,10) RC(1,11)
+            RC(2,0) RC(2,1) RC(2,2) RC(2,3) RC(2,4) RC(2,5)  RC(2,6) RC(2,7) RC(2,8) RC(2,9) RC(2,10) RC(2,11)
+            RC(3,0) RC(3,1) RC(3,2) RC(3,3) RC(3,4) RC(3,5)  RC(3,6) RC(3,7) RC(3,8) RC(3,9) RC(3,10) RC(3,11)
+		>;
+    };
+}