add neopixel example

platformio.ini

@@ -81,4 +81,19 @@ framework = ${common.framework}
 lib_deps = ${common.lib_deps}
     ESP8266mDNS
     painlessMesh
-    ArduinoOTA
+    ArduinoOTA
+
+[env:meshPixel]
+src_filter = +<*> -<examples/> +<examples/meshPixel/>
+platform = ${common.platform}
+board = ${common.board}
+upload_speed = ${common.upload_speed}
+monitor_baud = ${common.monitor_baud}
+framework = ${common.framework}
+lib_deps = ${common.lib_deps}
+    painlessMesh
+    ESP8266mDNS
+    ArduinoOTA
+    ESP Async WebServer
+    ESPAsyncTCP
+    Adafruit NeoPixel