Add pdfgrep.md to osx folder.

pages/osx/pdfgrep.md

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+# pdfgrep
+
+> Search text in PDF files.
+
+- Find lines that match pattern in a PDF:
+
+`pdfgrep {{pattern}} {{file.pdf}}`
+
+- Include file name and page number for each matched line:
+
+`pdfgrep --with-filename --page-number {{pattern}} {{file.pdf}}`
+
+- Do a case insensitive search for lines that begin with "foo" and return the first 3 matches:
+
+`pdfgrep --max-count {{3}} --ignore-case {{'^foo'}} {{file.pdf}}`
+
+- Find pattern in files with a .pdf extension in the current directory recursively:
+
+`pdfgrep --recursive {{pattern}}`
+
+- Find pattern on files that match a specific glob in the current directory recursively:
+
+`pdfgrep --recursive --include {{'*book.pdf'}} {{pattern}}`