- Added CMake target "apidoc" for creating Doxygen API documentation

diff --git a/Doxyfile b/Doxyfile
new file mode 100644
index 0000000..5110c67
--- /dev/null
+++ b/Doxyfile
@@ -0,0 +1,4 @@
+PROJECT_NAME    = PolarSSL
+INPUT           = include/polarssl
+HTML_OUTPUT     = apidoc
+GENERATE_LATEX  = NO