Update cheatsheets

fswebcam

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# fswebcam
+
+> Small and simple webcam for *nix.
+> More information: <https://www.sanslogic.co.uk/fswebcam>.
+
+- Take a picture:
+
+`fswebcam {{filename}}`
+
+- Take a picture with custom resolution:
+
+`fswebcam -r {{width}}x{{height}} {{filename}}`
+
+- Take a picture from selected device(Default is `/dev/video0`):
+
+`fswebcam -d {{device}} {{filename}}`
+
+- Take a picture with timestamp(timestamp string is formatted by strftime):
+
+`fswebcam --timestamp {{timestamp}} {{filename}}`