[cmake] add user preset example

CMakeUserPresets.json.example

@@ -0,0 +1,62 @@
+{
+  "version": 2,
+  "cmakeMinimumRequired": {
+    "major": 3,
+    "minor": 14,
+    "patch": 0
+  },
+  "configurePresets": [
+    {
+      "name": "dev-common",
+      "hidden": true,
+      "inherits": ["conan"],
+      "cacheVariables": {
+        "BUILD_MCSS_DOCS": "ON"
+      }
+    },
+    {
+      "name": "dev-unix",
+      "binaryDir": "${sourceDir}/build/dev-unix",
+      "inherits": ["dev-common", "ci-unix", "dev-mode"],
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug"
+      }
+    },
+    {
+      "name": "dev-win64",
+      "binaryDir": "${sourceDir}/build/dev-win64",
+      "inherits": ["dev-common", "ci-win64"]
+    },
+    {
+      "name": "dev",
+      "binaryDir": "${sourceDir}/build/dev",
+      "inherits": "dev-unix"
+    },
+    {
+      "name": "dev-coverage",
+      "binaryDir": "${sourceDir}/build/coverage",
+      "inherits": ["dev-mode", "coverage-unix", "conan"]
+    }
+  ],
+  "buildPresets": [
+    {
+      "name": "dev",
+      "configurePreset": "dev",
+      "configuration": "Debug",
+      "jobs": 4
+    }
+  ],
+  "testPresets": [
+    {
+      "name": "dev",
+      "configurePreset": "dev",
+      "configuration": "Debug",
+      "output": {
+        "outputOnFailure": true
+      },
+      "execution": {
+        "jobs": 4
+      }
+    }
+  ]
+}