sophia: fix reference

sophia: align documentation/README.md logo for github

sophia: add basic examples

Sophia v1.2.2 Release. (http://sphia.org)

Changelog:

* Prefix search (#69)
Match records against a specified key prefix.

* Compression (#67)
Supported compression libraries: lz4, zstd. Compression works in background.
Regions are compressed with meta-data.

* Asynchronous/Sync transactions
Execute transactions in parallel or run in blocking mode (default). Trigger is executed
upon a request completion.

* Asynchronous Drop/Shutdown (#65)
Database objects become versional. Drop happens async after last transaction commit.

* CRC optimizations and iterator refactoring (#68)
Use Intel hardware SSE extensions to calculate CRC where possible.