[FEATURE] Add .gitignore-File

A .gitignore file is widely used to ignore local files and folders
which are generated by some IDEs.

.gitignore

@@ -0,0 +1,19 @@
+# Ignoring temporary files (left by e.g. vim)
+# Ignoring by common IDE's used directories/files
+# Do not ignore .rej and .orig as we want to see/clean files after conflict resolution
+#
+# for local exclude patterns please edit .git/info/exclude
+#
+*~
+*.bak
+*.idea
+*.project
+*.swp
+.buildpath
+.cache
+.project
+.session
+.settings
+.TemporaryItems
+.webprj
+nbproject