tesseract: add page (#1267)

pages/common/tesseract.md

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+# tesseract
+
+> OCR (Optical Character Recognition) engine.
+
+- Recognize text in an image and save it to `output.txt`. The file extension MUST not be mentioned:
+
+`tesseract {{image.png}} {{output}}`
+
+- Specify a custom language (default is English) with an ISO 639-2 code (e.g. deu = Deutsch = German):
+
+`tesseract -l deu {{image.png}} {{output}}`
+
+- List the ISO 639-2 codes of available languages:
+
+`tesseract --list-langs`
+
+- Specify a custom page segmentation mode (default is 3):
+
+`tesseract -psm {{0_to_10}} {{image.png}} {{output}}`
+
+- List page segmentation modes and their descriptions:
+
+`tesseract --help-psm`