astyle: add page (#1543)

pages/common/astyle.md

@@ -0,0 +1,24 @@
+# astyle
+
+> Source code indenter, formatter, and beautifier for the C, C++, C# and Java programming languages.
+> Upon running, a copy of the original file is created with an ".orig" appended to the original file name.
+
+- Apply the default style of 4 spaces per indent and no formatting changes:
+
+`astyle {{source_file}}`
+
+- Apply the java style with attached braces:
+
+`astyle --style=java {{path/to/file}}`
+
+- Apply the allman style with broken braces:
+
+`astyle --style=allman {{path/to/file}}`
+
+- Apply a custom indent using spaces. Choose between 2 and 20 spaces:
+
+`astyle --indent=spaces={{number_of_spaces}} {{path/to/file}}`
+
+- Apply a custom indent using tabs. Choose between 2 and 20 tabs:
+
+`astyle --indent=tab={{number_of_tabs}} {{path/to/file}}`