docs: update cleanup section with detailed file structure example

Readme-Upgrade-to-4Series.md

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+![PepperDash Essentials Plugin Logo](/images/essentials-plugin-blue.png)
+
+# Upgrading an EPI: Essentials v1.x → v2.x
+
+## Preparation
+
+1. **Clone the Template Repo referred to as TR** to your local machine.
+    - [EssentialsPluginTemplate](https://github.com/PepperDash/EssentialsPluginTemplate) 
+2. **Checkout `main` branch** in the TR.
+
+## Branching
+
+4. In your EPI repo:
+   - Confirm it does **not already support Essentials v2.x**.
+   - Ensure there is **no existing 4-series update branch**.
+   - Create a new branch (e.g., `feature/4-series-updates`) from `main`.
+
+## Upgrade Steps
+
+5. In the new branch:
+   - **Replace** EPI `.github` files/folders with those from TR as needed.
+     - *Note:* Retain any custom workflows if required. Consult with PepperDash Team if unsure.
+   - **Copy** the following from TR to EPI:
+     - `.releaserc.json` (root)
+     - `epi-make-model.4Series.sln` (root)
+     - `src/epi-make-model.4Series.csproj` (create `src` folder if missing)
+     - `images` folder (if your `readme.md` lacks the standard logo)
+   - **Initial Commit:** Commit changes, but do **not** push yet.
+
+6. **If EPI has a `src/*.nuspec` file:**
+   - Record these values from `Nuspec` for later:
+     - `<id>` (Package ID)
+     - `<projectUrl>` (Project URL)
+     - `<title>` (Assembly Title)
+
+7. **Open Solution:**
+   - Open `epi-make-model.4Series.sln` in Visual Studio 2022.
+   - If errors occur, ensure the `.csproj` file is located within `src` folder.
+
+8. **Update Project Properties:**
+   - In `src/epi-make-model.4Series.csproj`, update:
+     - `AssemblyTitle` (from nuspec `<title>`)
+     - `RootNamespace` (from existing EPI, device namespace actual)
+     - `PackageProjectUrl` (from nuspec `<projectUrl>`)
+   - **Rename `make-model` build path references shown below:**  
+
+     ![defineBuildObjectstoRemove](/images/upgrade-to-4Series/removeObsoleteReferences.png)
+   - **Add runtime exclusion:**  
+     Add `<ExcludeAssets>runtime</ExcludeAssets>` to the PepperDash Essentials `PackageReference`. 
+
+     ![addRuntimeExclusion](/images/upgrade-to-4Series/addRuntumeExclusion.png)
+
+9. **Copy Build Files:**
+   - Copy `src/Directory.Build.props` and `src/Directory.Build.targets` from TR.
+   - Update `RepositoryUrl` in `Directory.Build.props` to match nuspec `PackageProjectUrl`.
+   - Remove "template" text from `<Product>` in `Directory.Build.props` as needed.
+
+10. **Clean Up:**
+    - Delete old Visual Studio 2008 files: `.sln`, `.suo`, `.nuspec`, `.csproj`, `.csproj.user`, `.projectinfo`.
+    - Ensure file structure matches below example:
+```
+  ├── src/
+  │   ├── Directory.Build.props
+  │   ├── Directory.Build.tagets
+  │   ├── *.3Series.csproj
+  │   └── *.4Series.csproj
+  ├── .releaserc.json
+  ├── *.3Series.sln
+  ├── *.4Series.sln
+  ├── LICENSE.md
+  └── README.md
+```
+
+11. **Rename Solution/Project** as needed.  
+
+    ![renameEpiSolution](/images/upgrade-to-4Series/renameEpiSolution.png)
+
+12. **Update Project References and Dependencies**
+    - Remove old PepperDash Essentials dependency.
+    - Add PepperDash Essentials v2.x dependency via Visual Studio 2022 > Project > `Manage Nuget Packages`.  
+
+    ![removeExistingReferences](/images/upgrade-to-4Series/removeExistingDependencies.png)
+
+13. **Update Factory Class:**  
+    Set `MinimumEssentialsFrameworkVersion` to match the Essentials version dependency.
+
+14. **Build Solution:**  
+    Ensure solution compiles (warnings about obsolete `Debug.Console` calls are OK).
+
+15. **Update Debug Calls:**  
+    Replace `Debug.Console` with `Debug.Log` methods as appropriate (see table). 
+
+    ![replaceDebugConsoleMethods](/images/upgrade-to-4Series/replaceExistingDebugConsoleMethods.png)
+
+## Completion Checklist
+
+- [ ] EPI compiles with **no warnings**.
+- [ ] **Obsolete methods** updated to modern equivalents.
+- [ ] **Workflows** complete successfully; packages generated via GitHub and NuGet.org.
+- [ ] `readme.md` includes:
+  - Usage/setup instructions
+  - Example SIMPL Windows bridge joinmap
+  - Example device communication structure/properties
+- [ ] EPI tested against full release Essentials version.
+- [ ] EPI tested by another developer.
+- [ ] Full release of EPI.
+
+---
+
+*For questions about workflows or customizations, consult with PepperDash Team.*