Release v0.2.0

Updates & Changes

• Third-party dependency gRPC (and its dependencies absl and protobuf) are now built from source for the C++ SDK to improve portability. We eventually plan to package these as statically linked libraries (fixes #6)

Fixes & Improvements

• Fix issue where C++ SDK could not be built on Ubuntu 22.04 due to a dependency issue with apt packaged version of gRPC
• Resolve issue where xronos-dashboard would not run on ARM v8.0 (Raspberry Pi 4, NVIDIA Jetson Nano) due to a breaking change in a Grafana dependency
• C++ SDK documentation fix broken link to examples in GitHub repository
• Add missing LICENSE file in root of public/ folder
• Add top-level README to for public repository