find: add page

pages/windows/find.md

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+# find
+
+> Find a specified string in one or more files.
+
+- Find lines that contain a specified string:
+
+`find {{string}} {{path/to/file_or_directory}}`
+
+- Display lines that do not contain the specified string:
+
+`find {{string}} {{path/to/file_or_directory}} /v`
+
+- Display the count of lines that contain the specified string:
+
+`find {{string}} {{path/to/file_or_directory}} /c`
+
+- Display line numbers with the list of lines:
+
+`find {{string}} {{path/to/file_or_directory}} /n`