Create MinGW.md

Author: bobbrow

Documentation/LanguageServer/MinGW.md

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+For developers using MinGW on Windows, we recommend you start with the following **c_cpp_properties.json** template.  Select "C/Cpp: Edit Configurations" from the command palette to create this file if you haven't already.
+
+```
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "intelliSenseMode": "clang-x64",
+            "includePath": [
+                "${workspaceRoot}",
+                "C:/MinGW/lib/gcc/mingw32/5.3.0/include/c++",
+                "C:/MinGW/lib/gcc/mingw32/5.3.0/include/c++/mingw32",
+                "C:/MinGW/lib/gcc/mingw32/5.3.0/include/c++/backward",
+                "C:/MinGW/lib/gcc/mingw32/5.3.0/include",
+                "C:/MinGW/include",
+                "C:/MinGW/lib/gcc/mingw32/5.3.0/include-fixed"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE"
+            ],
+            "browse": {
+                "path": [
+                    "C:/MinGW/lib/gcc/mingw32/5.3.0/include",
+                    "C:/MinGW/lib/gcc/mingw32/5.3.0/include-fixed",
+                    "C:/MinGW/include/*"
+                ],
+                "limitSymbolsToIncludedHeaders": true,
+                "databaseFilename": ""
+            }
+        }
+    ]
+}
+```
+
+The `includePath` above includes the system header paths that gcc uses in version 5.3.0 for C++ projects and matches the output of `gcc -v -E -x c++ -`. The `intelliSenseMode` should be set to **"clang-x64"** to get MinGW projects to work properly with IntelliSense.
+
+For C projects, simply remove the c++ lines:
+
+```
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "intelliSenseMode": "clang-x64",
+            "includePath": [
+                "${workspaceRoot}",
+                "C:/MinGW/lib/gcc/mingw32/5.3.0/include",
+                "C:/MinGW/include",
+                "C:/MinGW/lib/gcc/mingw32/5.3.0/include-fixed"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE"
+            ],
+            "browse": {
+                "path": [
+                    "C:/MinGW/lib/gcc/mingw32/5.3.0/include",
+                    "C:/MinGW/lib/gcc/mingw32/5.3.0/include-fixed",
+                    "C:/MinGW/include/*"
+                ],
+                "limitSymbolsToIncludedHeaders": true,
+                "databaseFilename": ""
+            }
+        }
+    ]
+}
+```
+
+With these configurations, you should be all set up to use the new IntelliSense engine for linting, memberlist autocomplete, and quick info (tooltips).  Add `"C_Cpp.intelliSenseEngine": "Default"` to your **settings.json** file to try out the new IntelliSense engine.