added more instructions for firmware flashing

code/esp8266/README.md

@@ -1,5 +1,14 @@
 # opencoil-paracity
 
+### Prerequisites
+
+This guide assumes you have a 4MB ESP12F microcontroller and use Arduino IDE.
+
+* Board Manager: You will need to add the support for this board to your IDE (Arduino in this case), see: https://github.com/esp8266/Arduino
+* SPIFFS: You will need to add SPIFFS file upload support to Arduino if you want to upload files to the ESP12F, see: https://github.com/esp8266/arduino-esp8266fs-plugin
+
+
+
 ### Uploading Code
 For ESP12F use the following settings in Arduino IDE
 
@@ -24,4 +33,4 @@ For ESP12F use the following settings in Arduino IDE
 * Programmer: AVRISP mkII
 
 
-These settings give you about 2.471 KB of SPIFSS storage space for files and ~512KB sketch size
+These settings give you about 2.471 KB of SPIFFS storage space for files and ~512KB sketch size