mruby: create package

pkgs/mruby/README.md

@@ -0,0 +1,6 @@
+KernAux
+=======
+
+[![Test](https://github.com/tailix/libkernaux/actions/workflows/test.yml/badge.svg)](https://github.com/tailix/libkernaux/actions/workflows/test.yml)
+
+Binding to **libkernaux** - auxiliary library for kernel development.

pkgs/mruby/mrbgem.rake

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+MRuby::Gem::Specification.new 'mruby-kernaux' do |spec|
+  spec.version = '0.0.0'
+  spec.license = 'MIT'
+  spec.homepage = 'https://github.com/tailix/libkernaux/tree/master/pkgs/ruby'
+  spec.author = 'Alex Kotov'
+
+  spec.summary =
+    'Binding to libkernaux - auxiliary library for kernel development'
+
+  spec.description = <<~DESCRIPTION.split("\n").map(&:strip).join ' '
+    Binding to libkernaux - auxiliary library for kernel development.
+  DESCRIPTION
+
+  spec.linker.libraries << 'kernaux'
+end

pkgs/mruby/src/main.c

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+#include <mruby.h>
+
+void mrb_mruby_kernaux_gem_final(mrb_state *mrb) {}
+
+void mrb_mruby_kernaux_gem_init(mrb_state *mrb)
+{
+    struct RClass *const rb_KernAux = mrb_define_module(mrb, "KernAux");
+}

pkgs/mruby/test/dummy.rb

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+assert 'Main module exists' do
+  assert_equal KernAux, ::KernAux
+end