Add SVD for the ESP8266

Author: aykevl

data/Espressif-Community/README.md

@@ -7,3 +7,5 @@ could not be extracted automatically.
 
   * esp32.svd: copied from the file at
     https://github.com/esp-rs/esp32/blob/master/svd/esp32.svd
+  * esp8266.svd: generated using `make` from the repo:
+    https://github.com/esp-rs/esp8266