indent: add page (#4443)

pages/common/indent.md

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+# indent
+
+> Change the appearance of a C/C++ program by inserting or deleting whitespace.
+> More information: <https://www.gnu.org/software/indent/>.
+
+- Format C/C++ source according to the Linux style guide, automatically back up the original files, and replace with the indented versions:
+
+`indent --linux-style {{path/to/source.c}} {{path/to/another_source.c}}`
+
+- Format C/C++ source according to the GNU style, saving the indented version to a different file:
+
+`indent --gnu-style {{path/to/source.c}} -o {{path/to/indented_source.c}}`
+
+- Format C/C++ source according to the style of Kernigan & Ritchie (K&R), no tabs, 3 spaces per indent, and wrap lines at 120 characters:
+
+`indent --k-and-r-style --indent-level3 --no-tabs --line-length120 {{path/to/source.c}} -o {{path/to/indented_source.c}}`

pages/osx/indent.md

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+# indent
+
+> Change the appearance of a C/C++ program by inserting or deleting whitespace.
+> More information: <https://www.freebsd.org/cgi/man.cgi?query=indent>.
+
+- Format C/C++ source according to the Berkeley style:
+
+`indent {{path/to/source.c}} {{path/to/indented_source.c}} -nbad -nbap -bc -br -c33 -cd33 -cdb -ce -ci4 -cli0 -di16 -fc1 -fcb -i4 -ip -l75 -lp -npcs -nprs -psl -sc -nsob -ts8`
+
+- Format C/C++ source according to the style of Kernigan & Ritchie (K&R):
+
+`indent {{path/to/source.c}} {{path/to/indented_source.c}} -nbad -bap -nbc -br -c33 -cd33 -ncdb -ce -ci4 -cli0 -cs -d0 -di1 -nfc1 -nfcb -i4 -nip -l75 -lp -npcs -nprs -npsl -nsc -nsob`