Add release notes and change log for version 2.2.6

diff --git a/SALOME2.2.6_Change_Log.pdf b/SALOME2.2.6_Change_Log.pdf
new file mode 100755 (executable)
index 0000000..5b83240
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diff --git a/SALOME2.2.6_Release_Notes.pdf b/SALOME2.2.6_Release_Notes.pdf
new file mode 100755 (executable)
index 0000000..269ae7e
Binary files /dev/null and b/SALOME2.2.6_Release_Notes.pdf differ