Added gcc (C++ compiler) to common

pages/common/gcc.md

@@ -0,0 +1,17 @@
+# gcc
+
+> Preprocesses and compiles C and C++ source files, then assembles and links them together.
+
+- Compile multiple source files into executable
+
+`gcc {{source1.c}} {{source2.c}} -o {{executable}}`
+
+- Allow warnings, debug symbols in output
+
+`gcc {{source.c}} -Wall -Og -o {{executable}}`
+
+- Include libraries from a different path
+
+`gcc {{source.c}} -o {{executable}} -I{{header_path}} -L{{library_path}} -l{{library_name}}`
+
+