Closes#4111.
gcc: I was not able to find an arm64 build on espressif's website so I choosed to put the armhf version, even if this should works this is only ok as temporary, arm64 runs better on arm64 than armhf :)
esptool: being interpreted python its ok
mkspiff: need igrr/mkspiffs#74 to be merged and artifacts added in /package/package_esp32_index.template.json.
* Added instructions for installation with boards manager (stolen directly from esp8266)
* changed to production link instead of dev
* Added to main README. Made mods to images as requested.
* Added links for development package
* Moved version images to README.md
* Just a little change for cleaner look
* Cleaned up README.md and boards_manager.md to make installation easier.
* Added instructions for installation with boards manager (stolen directly from esp8266)
* changed to production link instead of dev
* Added to main README. Made mods to images as requested.
* Added links for development package