docs: add issue template

Author: BuonOmo

.github/issue_template.md

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+<!-- NOTE: This template is copying most of the Rails repo template -->
+
+### Steps to reproduce
+
+<!-- (Guidelines for creating a bug report are [available
+here](https://edgeguides.rubyonrails.org/contributing_to_ruby_on_rails.html#creating-a-bug-report)) -->
+
+<!-- Paste your executable test case created from one of the scripts found [here](https://github.com/cockroachdb/activerecord-cockroachdb-adapter/tree/master/.github/reproduction_scripts) below: -->
+
+```ruby
+# Your reproduction script goes here
+```
+
+### Expected behavior
+
+<!-- Tell us what should happen -->
+
+### Actual behavior
+
+<!-- Tell us what happens instead -->
+
+### System configuration
+
+<!-- Either fill manually or paste the output of this script within code blocks:
+
+```bash
+bundle info rails | head -1 &&
+	ruby -v &&
+	bundle info activerecord-cockroachdb-adapter | head -1 &&
+	cockroach --version
+```
+-->
+
+<!--
+```
+# output here (and uncomment!)
+```
+-->
+
+**Rails version**:
+
+**Ruby version**:
+
+**Adapter version**:
+
+**CockroachDB version**:

.github/reproduction_scripts/migrations.rb

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+# frozen_string_literal: true
+#
+# Adapted from https://github.com/rails/rails/blob/main/guides/bug_report_templates/active_record_migrations.rb
+
+require "bundler/inline"
+
+gemfile(true) do
+  source "https://rubygems.org"
+
+  gem "activerecord"
+
+  gem "activerecord-cockroachdb-adapter"
+end
+
+require "activerecord-cockroachdb-adapter"
+require "minitest/autorun"
+require "logger"
+
+# You might want to change the database name for another one.
+ActiveRecord::Base.establish_connection("cockroachdb://root@localhost:26257/defaultdb")
+ActiveRecord::Base.logger = Logger.new(STDOUT)
+
+ActiveRecord::Schema.define do
+  create_table :payments, force: true do |t|
+    t.decimal :amount, precision: 10, scale: 0, default: 0, null: false
+  end
+end
+
+class Payment < ActiveRecord::Base
+end
+
+class ChangeAmountToAddScale < ActiveRecord::Migration::Current # or use a specific version via `Migration[number]`
+  def change
+    reversible do |dir|
+      dir.up do
+        change_column :payments, :amount, :decimal, precision: 10, scale: 2
+      end
+
+      dir.down do
+        change_column :payments, :amount, :decimal, precision: 10, scale: 0
+      end
+    end
+  end
+end
+
+class BugTest < ActiveSupport::TestCase
+  def test_migration_up
+    ChangeAmountToAddScale.migrate(:up)
+    Payment.reset_column_information
+
+    assert_equal "decimal(10,2)", Payment.columns.last.sql_type
+  end
+
+  def test_migration_down
+    ChangeAmountToAddScale.migrate(:down)
+    Payment.reset_column_information
+
+    assert_equal "decimal(10)", Payment.columns.last.sql_type
+  end
+end

.github/reproduction_scripts/models_and_database.rb

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+# frozen_string_literal: true
+#
+# Adapted from https://github.com/rails/rails/blob/main/guides/bug_report_templates/active_record.rb
+
+require "bundler/inline"
+
+gemfile(true) do
+  source "https://rubygems.org"
+
+  gem "activerecord"
+
+  gem "activerecord-cockroachdb-adapter"
+end
+
+require "activerecord-cockroachdb-adapter"
+require "minitest/autorun"
+require "logger"
+
+# You might want to change the database name for another one.
+ActiveRecord::Base.establish_connection("cockroachdb://root@localhost:26257/defaultdb")
+ActiveRecord::Base.logger = Logger.new(STDOUT)
+
+ActiveRecord::Schema.define do
+  create_table :posts, force: true do |t|
+  end
+
+  create_table :comments, force: true do |t|
+    t.integer :post_id
+  end
+end
+
+class Post < ActiveRecord::Base
+  has_many :comments
+end
+
+class Comment < ActiveRecord::Base
+  belongs_to :post
+end
+
+class BugTest < ActiveSupport::TestCase
+  def test_association_stuff
+    post = Post.create!
+    post.comments << Comment.create!
+
+    assert_equal 1, post.comments.count
+    assert_equal 1, Comment.count
+    assert_equal post.id, Comment.first.post.id
+  end
+end