[Docs] Add guide for updating REST resources

REST_RESOURCES.md

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+# Adding a New API Version to Shopify API Ruby
+
+## Overview
+This guide provides step-by-step instructions for adding a new API version to the Shopify API Ruby library. This example uses the addition of the 2025-07 API version as a reference, but the process applies to any new API version.
+
+## Prerequisites
+- Understanding of any breaking changes or removed resources in the new API version
+
+## Step 1: Update API Version Constants
+
+### Update admin_versions.rb
+Edit `lib/shopify_api/admin_versions.rb` to add your new version:
+
+```ruby
+module ShopifyAPI
+  module AdminVersions
+    SUPPORTED_ADMIN_VERSIONS = T.let([
+      "unstable",
+      "2025-10",  # Add new version here
+      "2025-07",
+      "2025-04",
+      # ... other versions
+    ], T::Array[String])
+
+    LATEST_SUPPORTED_ADMIN_VERSION = T.let("2025-07", String)  # Update if this is the latest stable
+    RELEASE_CANDIDATE_ADMIN_VERSION = T.let("2025-10", String)  # Update if this is RC
+  end
+end
+```
+
+**Version Management:**
+- Add new versions to the top of `SUPPORTED_ADMIN_VERSIONS`
+- Update `LATEST_SUPPORTED_ADMIN_VERSION` when the version is stable
+- Update `RELEASE_CANDIDATE_ADMIN_VERSION` for release candidates
+
+## Step 2: Create Directory Structure
+
+### Create Resource Directory
+```bash
+mkdir lib/shopify_api/rest/resources/{YYYY_MM}/
+```
+Example: `lib/shopify_api/rest/resources/2025_07/`
+
+### Create Test Directory
+```bash
+mkdir test/rest/{YYYY_MM}/
+```
+Example: `test/rest/2025_07/`
+
+**Directory Naming Convention:**
+- Format: `YYYY_MM` (e.g., `2025_04`, `2025_07`, `2025_10`)
+- Use underscore between year and month
+
+## Step 3: Copy Resource Files from Previous Version
+
+### Copy All Resource Files
+```bash
+# Copy resource files
+cp -r lib/shopify_api/rest/resources/{PREVIOUS_VERSION}/* lib/shopify_api/rest/resources/{NEW_VERSION}/
+
+# Copy test files
+cp -r test/rest/{PREVIOUS_VERSION}/* test/rest/{NEW_VERSION}/
+```
+
+Example:
+```bash
+cp -r lib/shopify_api/rest/resources/2025_04/* lib/shopify_api/rest/resources/2025_07/
+cp -r test/rest/2025_04/* test/rest/2025_07/
+```
+
+## Step 4: Update Test Files
+
+After copying test files, you must update version-specific information in each test file.
+
+### Update Test Class Names
+Change the class name to include the new version:
+
+```ruby
+# From
+class AbandonedCheckout202504Test < Test::Unit::TestCase
+
+# To
+class AbandonedCheckout202507Test < Test::Unit::TestCase
+```
+
+**Naming Pattern:** `{ResourceName}{YYYYMM}Test`
+- Remove underscores from the version (e.g., `202507` not `2025_07`)
+
+### Update Context API Version
+In the `setup` method, update the API version:
+
+```ruby
+def setup
+  super
+  test_session = ShopifyAPI::Auth::Session.new(id: "id", shop: "test-shop.myshopify.io", access_token: "this_is_a_test_token")
+  ShopifyAPI::Context.activate_session(test_session)
+
+  # Update this line:
+  modify_context(api_version: "2025-07")  # Was "2025-04"
+end
+```
+
+### Update URLs in Stub Requests
+Update all API URLs in the test methods:
+
+```ruby
+# From
+stub_request(:get, "https://test-shop.myshopify.io/admin/api/2025-04/checkouts.json")
+
+# To
+stub_request(:get, "https://test-shop.myshopify.io/admin/api/2025-07/checkouts.json")
+```
+
+## Step 5: Handle Breaking Changes
+
+### Identify Removed Resources
+In this example, `CustomerAddress` was removed in 2025-07.
+
+### Remove Deprecated Resources
+If a resource is removed:
+```bash
+# Remove resource file
+rm lib/shopify_api/rest/resources/{NEW_VERSION}/{resource_name}.rb
+
+# Remove test file
+rm test/rest/{NEW_VERSION}/{resource_name}_test.rb
+```
+
+### Update Modified Resources
+If a resource has structural changes:
+1. Update the resource class attributes
+2. Modify the `@paths` array if endpoints changed
+3. Update method signatures if parameters changed
+4. Adjust test cases accordingly
+
+## Step 7: Run Tests
+
+### Execute Test Suite
+```bash
+# Run all tests
+bundle exec rake test
+
+# Run specific version tests
+bundle exec rake test TEST=test/rest/{NEW_VERSION}/*
+```
+
+## Checklist
+
+- [ ] Added new version to `SUPPORTED_ADMIN_VERSIONS` in `admin_versions.rb`
+- [ ] Updated `LATEST_SUPPORTED_ADMIN_VERSION` if applicable
+- [ ] Updated `RELEASE_CANDIDATE_ADMIN_VERSION` if applicable
+- [ ] Created `lib/shopify_api/rest/resources/{NEW_VERSION}/` directory
+- [ ] Created `test/rest/{NEW_VERSION}/` directory
+- [ ] Copied all resource files from previous version
+- [ ] Copied all test files from previous version
+- [ ] Updated test class names (e.g., `Article202507Test`)
+- [ ] Updated API version in test contexts (`modify_context(api_version: "2025-07")`)
+- [ ] Updated all API URLs in test stub requests
+- [ ] Removed deprecated resources and their tests
+- [ ] Updated any modified resources
+- [ ] Run test suite successfully