FIxed expected version in CMakeLists.txt and added this version to readme#36

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matija9 wants to merge 3 commits intolbr-stack:fri-2.6from

matija9:fri-2.6

Commits on Feb 3, 2025

Fixed CMake to accept appropriate version of FRI SDK. Version in SDK is marked as 2.5 even thou it is downloaded from robot running on version 2.6 so CMake is also configured to request version 2.5
matija9
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Commits on Feb 4, 2025