Add bug report template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,77 @@
+---
+name: Bug report
+about: Notify us of an error or incorrect behaviour
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+<!--
+
+NOTE: Please use this form to submit bugs or demonstrations of non spec compliant behaviour
+
+-->
+
+**Description of the bug**
+
+<!--
+
+If this for behaviour that is not compliant with the OpenTelemetry Specification, please describe
+what happened and what you expected with a link to the relevant portion of the spec.
+
+-->
+
+**Share details about your runtime**
+
+Operating system details: Linux, Ubuntu 20.04 LTS
+RUBY_ENGINE: "ruby"
+RUBY_VERSION: "2.5.3"
+RUBY_DESCRIPTION: "ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-darwin19]"
+
+**Share a simplified reproduction if possible**
+
+```rb
+require 'bundler/inline'
+
+gemfile(true) do
+  source 'https://rubygems.org'
+
+  gem 'opentelemetry-api'
+  gem 'opentelemetry-sdk'
+  # gem 'opentelemetry-exporter-jaeger'
+  # gem 'opentelemetry-exporter-otlp'
+  # gem 'opentelemetry-exporter-zipkin'
+end
+
+require 'opentelemetry-api'
+require 'opentelemetry-sdk'
+
+span_processor = OpenTelemetry::SDK::Trace::Export::SimpleSpanProcessor.new(
+  OpenTelemetry::SDK::Trace::Export::ConsoleSpanExporter.new
+)
+
+# require 'opentelemetry/exporter/jaeger'
+# exporter = OpenTelemetry::Exporter::Jaeger::AgentExporter.new(max_packet_size: 9 * 1024)
+# span_processor = OpenTelemetry::SDK::Trace::Export::BatchSpanProcessor.new(exporter)
+
+# require 'opentelemetry/shopify/exporters/otlp'
+# exporter = OpenTelemetry::Exporter::OTLP::Exporter.new
+# span_processor = OpenTelemetry::SDK::Trace::Export::BatchSpanProcessor.new(exporter)
+
+# require 'opentelemetry/shopify/exporters/otlp'
+# exporter = OpenTelemetry::Exporter::OTLP::Exporter.new
+# span_processor = OpenTelemetry::SDK::Trace::Export::BatchSpanProcessor.new(exporter)
+
+OpenTelemetry::SDK.configure do |c|
+  c.add_span_processor(span_processor)
+end
+
+SimpleTracer = OpenTelemetry.tracer_provider.tracer('Bug Report')
+
+SimpleTracer.in_span('Parent span') do
+  1..10.times { SimpleTracer.in_span('child span') {} }
+end
+
+OpenTelemetry.tracer_provider.shutdown
+```