fix(gitignore): Add editor files into gitignore

Gitignore is updated with files and folders from editors to exclude.

Author: bcabanes

Diff for: .gitignore

@@ -38,3 +38,18 @@ ng-sample/app/nativescript-angular
 startup-test/platforms
 startup-test/lib
 startup-test/node_modules
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json