add .ionide to the gitignore

Author: AngelMunoz

.gitignore

@@ -249,6 +249,9 @@ paket-files/
 # FAKE - F# Make
 .fake/
 
+# F# Ionide vscode plugin files
+.ionide/
+
 # JetBrains Rider
 .idea/
 *.sln.iml
@@ -258,4 +261,5 @@ paket-files/
 
 # Python Tools for Visual Studio (PTVS)
 __pycache__/
-*.pyc
+*.pyc
+