Initialize.

Author: yuuu

README.md

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+# mruby-esp32-spi
+
+SPI library for mruby-esp32.
+
+## Installation
+
+You need [esp-idf v5.0](https://docs.espressif.com/projects/esp-idf/en/release-v5.0/esp32/index.html) to use this mrbgems.
+
+Add the line below to your `build_config.rb`:
+
+```ruby
+  conf.gem :github => 'yuuu/mruby-esp32-spi'
+```
+
+## Examples
+
+```ruby
+spi = SPI.new
+spi = SPI.new(unit: 1, mode: 0, frequency:10_000_000, first_bit: SPI::MSB_FIRST)
+
+spi.setmode(unit: 1, mode: 0, frequency:10_000_000, first_bit: SPI::MSB_FIRST)
+
+spi.write(0x30, 0x20, 0x00)
+spi.write("\x30\xa2")
+spi.write(0x30)
+
+data = spi.read( 32 )
+
+s = spi.transfer([0x30, 0x20], 1)
+
+```
+
+## LICENSE
+
+MIT License.