[Added] Doc on generating Code128 Barcode (#746)

CHANGELOG.md

@@ -20,6 +20,9 @@ This can also be enabled programmatically with `warnings.simplefilter('default',
 ### Fixed
 - the SVG parser now accepts `<rect>` with `width` / `height` defined as percents
 
+### Added
+- documentation on how to generate Code128 barcodes using the `python-barcode` lib: [documentation section](https://pyfpdf.github.io/fpdf2/Barcodes.html#Code128)
+
 ## [2.7.1] - 2023-03-27
 ### Changed
 - renamed `fonts.FontStyle` to [`fonts.FontFace`](https://pyfpdf.github.io/fpdf2/fpdf/fonts.html#fpdf.fonts.FontFace), and `FPDF.use_font_style` to [`FPDF.use_font_face`](https://pyfpdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.FPDF.FPDF.use_font_face), to avoid confusions with `FPDF.font_style`

docs/Barcodes.md

@@ -138,3 +138,37 @@ pdf.set_font("Helvetica", size=24)
 pdf.datamatrix("Hello world!", w=100)
 pdf.output("datamatrix.pdf")
 ```
+
+## Code128 ##
+
+Here is an example on how to generate a [Code 128](https://en.wikipedia.org/wiki/Code_128) barcode
+using the [`python-barcode`](https://github.com/WhyNotHugo/python-barcode) lib:
+
+```
+from io import BytesIO
+from fpdf import FPDF
+from barcode import Code128
+from barcode.writer import SVGWriter
+
+# Create a new PDF document
+pdf = FPDF()
+pdf.add_page()
+
+# Set the position and size of the image in the PDF
+x = 50
+y = 50
+w = 100
+h = 70
+
+# Generate a Code128 Barcode
+byte_stream_object = BytesIO()
+Code128(str("100000902922"), writer=SVGWriter()).write(byte_stream_object)
+pdf.image(byte_stream_object, x=x, y=y, w=w, h=h)
+
+# Output a PDF named code128_barcode.pdf
+pdf.output('code128_barcode.pdf')
+```
+
+Output Preview:
+![](code128_barcode.png)
+