pdfgrep: add page

pages/linux/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}}`
+
+- Find the first 3 lines that begin with foo case insensitive:
+
+`pdfgrep --max-count {{3}} --ignore-case {{'^foo'}} {{file.pdf}}`
+
+- Find pattern in pdf files under the current directory recusively:
+
+`pdfgrep --recursive --include {{'*.pdf'}} {{pattern}}`