README.md in invoice_printer-1.0.0 vs README.md in invoice_printer-1.1.0.rc1

@@ -2,17 +2,17 @@
   <img src="./docs/web/logo.png" width="300" />
 </a>
 
 &nbsp;
 
-Super simple PDF invoicing in pure Ruby (based on Prawn library).
+Super simple PDF invoicing in pure Ruby
 
-InvoicePrinter does not impose any validations nor calculations on you. It is
-designed only to provide an interface to build the PDF version of these documents.
+InvoicePrinter is a Ruby library and a command line program. You can use Ruby or JSON to build the final PDF.
 
 ## Features
 
+- A4 and US letter paper size
 - Invoice/document name and number
 - Purchaser and provider boxes with addresses and identificaton numbers
 - Payment method box showing banking details including SWIFT and IBAN fields
 - Issue/due dates box
 - Configurable items' table with item description, quantity, unit, price per unit, tax and item's total amount fields
@@ -22,10 +22,12 @@
 - Configurable font file
 - Logotype (as image scaled to fit 50px of height)
 - Background (as image)
 - Stamp & signature (as image)
 - Note
+- JSON format
+- CLI
 - Well tested
 
 ## Example
 
 | Simple invoice |
@@ -142,12 +144,67 @@
     }
   end
 end
 ```
 
+### JSON format
+
+JSON format is supported via `from_json` method. JSON itself mimicks the original Ruby objects:
+
+```ruby
+json = InvoicePrinter::Document.new(...).to_json
+document = InvoicePrinter::Document.from_json(json)
+
+
+InvoicePrinter.print(
+  document:  document,
+  ...
+)
+
+```
+
+## CLI
+
+InvoicePrinter ships with a command line executable called `invoice_printer`.
+
+It supports all features except it only accepts JSON as an input.
+
+```
+$ invoice_printer --help
+Usage: invoice_printer [options]
+
+Options:
+
+    -l, --labels   labels as JSON
+  -d, --document   document as JSON
+     -s, --stamp   path to stamp
+          --logo   path to logotype
+          --font   path to font
+     --page_size   letter or a4 (letter is the default)
+  -f, --filename   output path
+    -r, --render   directly render PDF stream (filename option will be ignored)
+```
+
+
 ## Customization
 
+### Page size
+
+Both A4 and US letter is supported. Just pass `page_size` as an argument to `print` or `render` methods:
+
+```ruby
+InvoicePrinter.print(
+  document: invoice,
+  labels: labels,
+  page_size: :a4,
+  file_name: 'invoice.pdf'
+)
+```
+
+`:letter` is the default.
+
+
 ### Localization
 
 To localize your documents you can set both global defaults or instance
 overrides:
 
@@ -170,11 +227,11 @@
 Here is the full list of labels to configure. You can paste and edit this block
 to `initializers/invoice_printer.rb` if you are using Rails.
 
 ```ruby
 InvoicePrinter.labels = {
-  name: 'Invoice'
+  name: 'Invoice',
   provider: 'Provider',
   purchaser: 'Purchaser',
   tax_id: 'Identification number',
   tax_id2: 'Identification number',
   payment: 'Payment',
@@ -191,10 +248,10 @@
   price_per_item: 'Price per item',
   amount: 'Amount',
   tax: 'Tax',
   tax2: 'Tax 2',
   tax3: 'Tax 3',
-  subtotal: 'Subtotal'
+  subtotal: 'Subtotal',
   total: 'Total'
 }
 ```
 
 You can also use sublabels feature to provide the document in two languages: