SALOME 6.5.0 preparation: add release notes

diff --git a/SALOME_6_4_0_Release_Notes.pdf b/SALOME_6_4_0_Release_Notes.pdf
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diff --git a/SALOME_6_5_0_Release_Notes.pdf b/SALOME_6_5_0_Release_Notes.pdf
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index 0000000..2251523
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