chore: Add initial library.json config

Added initial library.json config for PlatformIO

Version will be synced to proper googletest version once the PIO library has been registered and proven out round trip.

library.json

+{
+  "name": "googletest",
+  "keywords": "unittest, unit, test, gtest, gmock",
+  "description": "googletest is a testing framework developed by the Testing Technology team with Google's specific requirements and constraints in mind. No matter whether you work on Linux, Windows, or a Mac, if you write C++ code, googletest can help you. And it supports any kind of tests, not just unit tests.",
+   "license": "BSD-3-Clause",
+  "homepage": "https://github.com/abseil/googletest/blob/master/README.md",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/abseil/googletest.git"
+  },
+  "version": "0.0.1",
+  "exclude": [
+    "ci",
+    "googlemock/build-aux",
+    "googlemock/cmake",
+    "googlemock/make",
+    "googlemock/msvc",
+    "googlemock/scripts",
+    "googlemock/test",
+    "googlemock/CMakeLists.txt",
+    "googlemock/Makefile.am",
+    "googlemock/configure.ac",
+    "googletest/cmake",
+    "googletest/codegear",
+    "googletest/m4",
+    "googletest/make",
+    "googletest/msvc",
+    "googletest/scripts",
+    "googletest/test",
+    "googletest/xcode",
+    "googletest/CMakeLists.txt",
+    "googletest/Makefile.am",
+    "googletest/configure.ac",
+  ],
+  "frameworks": "arduino",
+  "platforms": [
+        "espressif32"
+    ],
+    "export": {
+        "include": [
+            "googlemock/include/*",
+            "googletest/include/*"
+        ]
+    },
+    "build": {
+        "flags": [
+            "-I googlemock/include",
+            "-I googletest/include"
+        ]
+    }
+}