Add .gitattributes file

Change-Id: I07963218c7f1ece46af59ba1804fbd2e9a91fa30
Issue-ID: NONRTRIC-88
Signed-off-by: maximesson <maxime.bonneau@est.tech>

near-rt-ric-simulator/.gitattributes

+# https://help.github.com/articles/dealing-with-line-endings/
+
+# Set the default behavior, in case people don't have core.autocrlf set.
+*        text=auto
+
+# Explicitly declare text files you want to always be normalized
+# and converted to native line endings on checkout.
+*.c      text diff=cpp
+*.cpp    text diff=cpp
+*.css    text
+*.go     text diff=golang
+*.htm    text diff=html
+*.html   text diff=html
+*.java   text diff=java
+*.js     text
+*.jsp    text
+*.less   text
+*.properties text
+*.py     text diff=python
+*.sql    text
+*.xml    text
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary