chore: Remove CRLF restriction and Add extension recommendation (#448)

Author: jdneo

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+	// See http://go.microsoft.com/fwlink/?LinkId=827846
+	// for the documentation about the extensions.json format
+	"recommendations": [
+		"shengchen.vscode-checkstyle",
+		"yaozheng.vscode-pde"
+	]
+}

jdtls.ext/check_style.xml

@@ -31,12 +31,6 @@
         <property name="message" value="Line has trailing spaces."/>
     </module>
 
-    <!-- CRLF is not allowed -->
-    <module name="RegexpMultiline">
-        <property name="format" value="(?s:(\r\n|\r).*)"/>
-        <property name="message" value="CRLF and CR line endings are prohibited, but this file uses them."/>
-    </module>
-
     <module name="LineLengthCheck">
         <property name="fileExtensions" value="java" />
         <!-- Checks if a line is too long. -->