chore(git):增加屏蔽可能出现的证书文件。

.gitignore

@@ -1,4 +1,3 @@
-
 # Windows thumbnail cache files
 Thumbs.db
 Thumbs.db:encryptable
@@ -30,7 +29,7 @@ $RECYCLE.BIN/
 .LSOverride
 
 # Icon must end with two \r
-Icon
+Icon
 
 # Thumbnails
 ._*
@@ -301,3 +300,7 @@ Cargo.lock
 
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
+
+# Certificate files
+**/*.key
+**/*.pem