fix: add benchmarks

Author: SpringMT

benchmarks/large_bytes.rb

@@ -0,0 +1,22 @@
+$LOAD_PATH.unshift '../lib'
+require 'zstd-ruby'
+require 'securerandom'
+
+source_data = ""
+512.times { source_data += SecureRandom.uuid }
+
+puts "source_data.size:#{source_data.size}"
+
+# Test compressing and de-compressing our source data 100,000 times.  The cycles
+# are intended to exercise the libary and reproduce a memory leak.
+100_000.times do |i|
+  compressed_data = Zstd.compress(source_data)
+  expanded_data = Zstd.decompress(compressed_data)
+  unless expanded_data == source_data
+    puts "Error: expanded data does not match source data"
+  end
+  if i % 1000 == 0
+    puts " - #{i}: c:#{compressed_data.size} e:#{expanded_data.size} memory:#{`ps -o rss= -p #{Process.pid}`.to_i}"
+  end
+
+end