Update cheatsheets

tldr/ppmdraw

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ppmdraw
+
+> Draw lines, text and more on a PPM image by executing a script.
+> Documentation on the utilized scripting language can be found by following the link below.
+> More information: <https://netpbm.sourceforge.net/doc/ppmdraw.html>.
+
+- Draw on the specified PPM image by executing the supplied script:
+
+`ppmdraw -script '{{setpos 50 50; text_here "hello!"; }}' {{path/to/image.pnm}} > {{path/to/output.pnm}}`
+
+- Draw on the specified PPM image by executing the script in the specified file:
+
+`ppmdraw -scriptfile {{path/to/script}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`