fix code style profile name -> UIWidgets

update README.md, add code cleanup section

README.md

 Specify Upstream URL as "git@gitlab.cds.internal.unity3d.com:upm-packages/ui-widgets/idea-settings.git"
 and click "Overwrite Local" or "Merge".
 
-REF: https://www.jetbrains.com/help/idea/sharing-your-ide-settings.html#settings-repository
+REF: https://www.jetbrains.com/help/idea/sharing-your-ide-settings.html#settings-repository
+
+
+## Code Style Cleanup
+
+1. **Import the Customized Code Cleanup Setting**: Open Preferences -> Manage Layers, 
+Choose 'Solution "\<YourProjectName\>" personal' and Click "Add Layer" ("+") -> "Open Settings File...".
+and Open the file "UIWidgetCleanupPlugin.DotSettings" under \<YourProjectPath\>/Packages/com.unity.uiwidgets/"
+
+2. **Cleanup Code style using the Customized Code Cleanup Setting**: Open Code -> Code Cleanup,
+Pick a Cleanup scope as you want and Choose the "UIWidgets" as the "Code cleanup profile", then click "OK"
+
+3. **Refine Code Style Rules**: Edit the ".editorconfig" file under \<YourProjectPath\>/Packages/com.unity.uiwidgets/"

UIWidgetCleanupPlugin.DotSettings

 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
-	<s:String x:Key="/Default/CodeStyle/CodeCleanup/Profiles/=UIWidget/@EntryIndexedValue">&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;Profile name="UIWidget"&gt;&lt;JsReformatCode&gt;True&lt;/JsReformatCode&gt;&lt;CSCodeStyleAttributes ArrangeTypeAccessModifier="True" ArrangeTypeMemberAccessModifier="True" SortModifiers="False" RemoveRedundantParentheses="False" AddMissingParentheses="True" ArrangeBraces="False" ArrangeAttributes="False" ArrangeArgumentsStyle="False" ArrangeCodeBodyStyle="False" ArrangeVarStyle="False" /&gt;&lt;CSOptimizeUsings&gt;&lt;OptimizeUsings&gt;True&lt;/OptimizeUsings&gt;&lt;EmbraceInRegion&gt;False&lt;/EmbraceInRegion&gt;&lt;RegionName&gt;&lt;/RegionName&gt;&lt;/CSOptimizeUsings&gt;&lt;CSReformatCode&gt;True&lt;/CSReformatCode&gt;&lt;CSFixBuiltinTypeReferences&gt;True&lt;/CSFixBuiltinTypeReferences&gt;&lt;CSArrangeQualifiers&gt;True&lt;/CSArrangeQualifiers&gt;&lt;CSShortenReferences&gt;True&lt;/CSShortenReferences&gt;&lt;IDEA_SETTINGS&gt;&amp;lt;profile version="1.0"&amp;gt;
-  &amp;lt;option name="myName" value="UIWidget" /&amp;gt;
+	<s:String x:Key="/Default/CodeStyle/CodeCleanup/Profiles/=UIWidgets/@EntryIndexedValue">&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;Profile name="UIWidgets"&gt;&lt;JsReformatCode&gt;True&lt;/JsReformatCode&gt;&lt;CSCodeStyleAttributes ArrangeTypeAccessModifier="True" ArrangeTypeMemberAccessModifier="True" SortModifiers="False" RemoveRedundantParentheses="False" AddMissingParentheses="True" ArrangeBraces="False" ArrangeAttributes="False" ArrangeArgumentsStyle="False" ArrangeCodeBodyStyle="False" ArrangeVarStyle="False" /&gt;&lt;CSOptimizeUsings&gt;&lt;OptimizeUsings&gt;True&lt;/OptimizeUsings&gt;&lt;EmbraceInRegion&gt;False&lt;/EmbraceInRegion&gt;&lt;RegionName&gt;&lt;/RegionName&gt;&lt;/CSOptimizeUsings&gt;&lt;CSReformatCode&gt;True&lt;/CSReformatCode&gt;&lt;CSFixBuiltinTypeReferences&gt;True&lt;/CSFixBuiltinTypeReferences&gt;&lt;CSArrangeQualifiers&gt;True&lt;/CSArrangeQualifiers&gt;&lt;CSShortenReferences&gt;True&lt;/CSShortenReferences&gt;&lt;IDEA_SETTINGS&gt;&amp;lt;profile version="1.0"&amp;gt;
+  &amp;lt;option name="myName" value="UIWidgets" /&amp;gt;
   &amp;lt;inspection_tool class="ES6ShorthandObjectProperty" enabled="false" level="INFORMATION" enabled_by_default="false" /&amp;gt;
   &amp;lt;inspection_tool class="JSArrowFunctionBracesCanBeRemoved" enabled="false" level="INFORMATION" enabled_by_default="false" /&amp;gt;
   &amp;lt;inspection_tool class="JSPrimitiveTypeWrapperUsage" enabled="false" level="WARNING" enabled_by_default="false" /&amp;gt;