Add configuration file for docs.mbed.com builds

Author: sg-

doxygen_options.json

@@ -0,0 +1,26 @@
+{
+    "ENABLE_PREPROCESSING": "YES",
+    "MACRO_EXPANSION": "YES",
+    "EXPAND_ONLY_PREDEF": "NO",
+    "SEARCH_INCLUDES": "YES",
+    "INCLUDE_PATH": "", 
+    "INCLUDE_FILE_PATTERNS": "", 
+    "PREDEFINED": ["DOXYGEN_ONLY", "MBED_DEPRECATED_SINCE(f, g)="],
+    "EXPAND_AS_DEFINED": "", 
+    "SKIP_FUNCTION_MACROS": "NO",
+    "EXCLUDE_PATTERNS": ["*/targets/*",
+                         "*/features/FEATURE_*/*",
+                         "*/features/mbedtls/*",
+                         "*/features/nanostack/*",
+                         "*/features/storage/*",
+                         "*/features/unsupported/*",
+                         "*/features/frameworks/*",
+                         "*/features/filesystem/fat/*",
+                         "*/BUILD/*",
+                         "*/rtos/*",
+                         "*/events/*",
+                         "*/platform/*",
+                         "*/cmsis/*",
+                         "*/hal/*",
+                         "*/features/*"]
+}