Update cheatsheets

ppmlabel

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ppmlabel
+
+> Add text to a PPM image.
+> More information: <https://netpbm.sourceforge.net/doc/ppmlabel.html>.
+
+- Add text to a PPM image at the specified location:
+
+`ppmlabel -x {{pos_x}} -y {{pos_y}} -text {{text}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}`
+
+- Add multiple texts at different locations:
+
+`ppmlabel -x {{pos_x1}} -y {{pos_y1}} -text {{text1}} -x {{pos_x2}} -y {{pos_y2}} -text {{text2}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}`
+
+- Specify the line color, the background color, the tilt and the size of the added text:
+
+`ppmlabel -x {{pos_x}} -y {{pos_y}} -color {{line_color}} -background {{background_color}} -angle {{tilt}} -size {{size}} -text {{text}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}`