Request bodies for various POST requests missing

[CodeShakingSheep]

As I was working with the API, I just figured that various request bodies for POST requests are missing in the API docs. Concerns the following POST requests:

• Create recurring invoice
• Create quote
• Create credit
• Create project
• Create task
• Create vendor
• Create purchase order
• Adds an expense
• Adds a recurring expense
• Adds a bank_transaction (also fix spelling: Adds a bank transaction)
• Adds a bank_integration (also fix spelling: Adds a bank integration)
• Adds a bank_transaction rule (also fix spelling: Adds a bank transaction rule)
• Adds a client payment token
• Adds a company
• Adds a CompanyGateway (also fix spelling: Adds a company gateway)
• Adds a design
• Adds a expense category (also fix spelling: Adds an expense category)
• Adds a GroupSetting (also fix spelling: Adds a group setting)
• Adds a RecurringQuote (also fix spelling: Adds a recurring quote)
• Adds a subscriptions (also fix spelling: Adds a subscription)
• Adds a token
• Adds a User
• Adds a Webhook