Slightly modified the README.md
Slightly modified the README.md

1. Changed some casing
2. Updated the link for "Git for Windows"
3. Changed some wording
4. Changed some paths

OData/odatacpp-client,lewischeng-ms/odatacpp-client,lewischeng-ms/odatacpp-client,lewischeng-ms/odatacpp-client,OData/odatacpp-client,OData/odatacpp-client