added custom distro

layers/meta-devdistro/conf/layer.conf

@@ -0,0 +1,16 @@
+# Add layer to BitBake search path
+BBPATH .= ":${LAYERDIR}"
+
+# Where recipes live
+BBFILES += "\
+    ${LAYERDIR}/recipes-*/*/*.bb \
+    ${LAYERDIR}/recipes-*/*/*.bbappend \
+"
+
+# Layer identification (REQUIRED)
+BBFILE_COLLECTIONS += "devdistro"
+BBFILE_PATTERN_devdistro = "^${LAYERDIR}/"
+BBFILE_PRIORITY_devdistro = "8"
+
+# Yocto release compatibility (REQUIRED, else warning)
+LAYERSERIES_COMPAT_devdistro = "scarthgap"