fix: update gitignore

Signed-off-by: Junjie Gao <[email protected]>

.gitignore

@@ -1,6 +1,16 @@
-# If you prefer the allow list template instead of the deny list, see community template:
-# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+# Copyright The Notary Project Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
 #
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 # Binaries for programs and plugins
 *.exe
 *.exe~
@@ -19,3 +29,12 @@
 
 # Go workspace file
 go.work
+
+# Code Editors
+.vscode
+.idea
+*.sublime-project
+*.sublime-workspace
+
+# Custom
+coverage.txt