import recipes: todo add to site

todo-recipes/pdf.md

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+# pdf
+
+## Pull a page range from a pdf
+
+```bash
+pdftk {filename.pdf} cat {page ranges} output {output.pdf}
+```
+
+## Get metadata of a pdf
+
+```bash
+pdfinfo {filename.pdf}
+```
+
+## Concatenate a bunch of pdfs
+
+Note: I think this overwrites the last input file if you forget to specify an output!!
+
+```bash
+pdfunite {file.pdf...} {output.pdf}
+```
+