c_cpp_properties.json in readme

README.md

diff --git a/README.md b/README.md
index 89feba3..9ba9d9e 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,27 @@
-# delaunator-cpp
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+# delaunator-cpp
+
+**c_cpp_properties.json**
+
+```
+{
+    "configurations": [
+        {
+            "name": "CPP Mac",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "/usr/include/**"
+            ],
+            "defines": [],
+            "macFrameworkPath": [
+                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/System/Library/Frameworks"
+            ],
+            "compilerPath": "/usr/bin/clang",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "clang-x64",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json"
+        }
+    ],
+    "version": 4
+}
+```
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