uncrustify: add page (#3904)

pages/common/uncrustify.md

@@ -0,0 +1,28 @@
+# uncrustify
+
+> C, C++, C#, D, Java and Pawn source code formatter.
+> More information: <https://github.com/uncrustify/uncrustify>.
+
+- Format a single file:
+
+`uncrustify -f {{path/to/file.cpp}} -o {{path/to/output.cpp}}`
+
+- Read filenames from stdin, and take backups before writing output back to the original filepaths:
+
+`find . -name "*.cpp" | uncrustify -F - --replace`
+
+- Don't make backups (useful if files are under version control):
+
+`find . -name "*.cpp" | uncrustify -F - --no-backup`
+
+- Use a custom configuration file and write the result to stdout:
+
+`uncrustify -c {{path/to/uncrustify.cfg}} -f {{path/to/file.cpp}}`
+
+- Explicitly set a configuration variable's value:
+
+`uncrustify --set {{option}}={{value}}`
+
+- Generate a new configuration file:
+
+`uncrustify --update-config -o {{path/to/new.cfg}}`