README.md in razorpay-2.1.0 vs README.md in razorpay-2.2.0

@@ -122,10 +122,37 @@
 invoice = Razorpay::Invoice.create customer_id: customer.id, amount: 100, currency: 'INR', description: 'Test description', type: 'link'
 ```
 
 You can find invoices API documentation at <https://docs.razorpay.com/v1/page/invoices>.
 
+### Plan
+```rb
+# Creating a plan
+plan = Razorpay::Plan.create interval: 1, period: 'monthly', item: { name: 'fake_plan', description: 'fake_desc', currency: 'INR', amount: 500 }, notes: { identifier: 'plan_monthly_super' }
+```
+
+You can find plan API documentation at <https://razorpay.com/docs/subscriptions/api/#plan>.
+
+### Subscription
+```rb
+# Creating a subscription and starting after 24 hours (24 hours = 60 * 60 * 24)
+subscription = Razorpay::Subscription.create plan_id: plan.id, customer_id: customer.id, start_at: (Time.now + (60 * 60 * 24)).to_i, total_count: 3
+```
+
+You can find subscription API documentation at <https://razorpay.com/docs/subscriptions/api/#subscription>.
+
+### Addon
+```rb
+# Creating an addon
+subscription_addon = Razorpay::Addon.create subscription.id, item: { name: 'fake_plan', description: 'fake_desc', currency: 'INR', amount: 500 }, quantity: 1
+
+# Fetching an addon
+addon = Razorpay::Addon.fetch subscription_addon.id
+```
+
+You can find addon API documentation at <https://razorpay.com/docs/subscriptions/api/#add-on>.
+
 ## Development
 
 - Everything is namespaced under the Razorpay module
 - We use rubocop for checking style guidelines
 - Rake + MiniTest is using as the testrunner
@@ -140,9 +167,22 @@
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Run `rake` and `rubocop` after making your changes to make sure you didn't break anything
 4. Commit your changes (`git commit -am 'Add some feature'`)
 5. Push to the branch (`git push origin my-new-feature`)
 6. Create a new Pull Request
+
+## Supported Versions
+
+While we support [all currently supported versions of Ruby](https://www.ruby-lang.org/en/downloads/branches/)
+only, the code is tested against the following versions:
+
+* 1.9.3
+* 2.0.0
+* 2.1.10
+* 2.2.9
+* 2.3.6
+* 2.4.2
+* 2.5.0
 
 ## Release
 
 Steps to follow for a release: