add ruby example, update README.md

crates/servicepoint_binding_uniffi/libraries/ruby/example/Gemfile

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+source 'https://rubygems.org'
+
+gem 'servicepoint', path: '..'

crates/servicepoint_binding_uniffi/libraries/ruby/example/Gemfile.lock

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+PATH
+  remote: ..
+  specs:
+    servicepoint (0.0.0)
+      ffi
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ffi (1.17.0-x86_64-linux-gnu)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  servicepoint!
+
+BUNDLED WITH
+   2.3.27

crates/servicepoint_binding_uniffi/libraries/ruby/example/example.rb

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+require_relative "../lib/servicepoint_binding_uniffi"
+
+include ServicepointBindingUniffi
+
+connection = Connection.new("172.23.42.29:2342")
+
+pixels = Bitmap.new_max_sized
+x_offset = 0
+loop do
+
+  pixels.fill(false)
+
+  (0..((pixels.height) -1)).each do |y|
+    pixels.set((y + x_offset) % pixels.width, y, true);
+  end
+
+  command = Command.bitmap_linear_win(0, 0, pixels, CompressionCode::UNCOMPRESSED)
+
+  connection.send(command)
+  sleep 0.0005
+
+  x_offset += 1
+end
+
+

crates/servicepoint_binding_uniffi/libraries/ruby/example/example.sh

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+#!/usr/bin/env bash
+
+LD_LIBRARY_PATH="../../../../../target/release:$LD_LIBRARY_PATH" ruby example.rb

crates/servicepoint_binding_uniffi/libraries/ruby/servicepoint.gemspec

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+Gem::Specification.new do |s|
+  s.name        = "servicepoint"
+  s.version     = "0.0.0"
+  s.summary     = ""
+  s.description = ""
+  s.authors     = ["kaesaecracker"]
+  s.email       = ""
+  s.files       = ["lib/servicepoint_binding_uniffi.rb"]
+  s.homepage    =
+    "https://rubygems.org/gems/hola"
+  s.license       = "MIT"
+  s.add_dependency 'ffi'
+end