add lib info files

lib/lib_audio/ESP8266Audio/library.json

@@ -20,6 +20,7 @@
         "SPI": "1.0"
     },
     "frameworks": "Arduino",
+    "platforms": ["espressif8266", "espressif32"],
     "examples": [
         "examples/*/*.ino"
     ]

lib/lib_audio/ESP8266SAM/library.json

@@ -17,6 +17,7 @@
     "version": "1.0",
     "homepage": "https://github.com/earlephilhower/ESP8266SAM",
     "frameworks": "Arduino",
+    "platforms": ["espressif8266", "espressif32"],
     "examples": [
         "examples/*/*.ino"
     ]