Fix capitalization of 'OpenCode' to 'opencode'

contributing.md

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+# Contribution Guidelines
+
+Thank you for your interest in contributing to `awesome-opencode`! Your suggestions are essential for making this list a great resource for the community. We're excited to see what you've found.
+
+To keep things organized and allow for community input, **we manage all new additions through GitHub Discussions.**
+
+## How to Suggest an Addition
+
+Instead of opening a Pull Request, please follow these simple steps:
+
+1.  **Go to the [Discussions Tab](https://github.com/ShamanicArts/awesome-opencode/discussions)**.
+2.  **Choose the correct category** for your suggestion (e.g., `Plugins`, `Themes`, `Agents`, etc.).
+3.  **Start a new Discussion** with a clear title.
+4.  In the body, please include:
+    *   A link to the resource.
+    *   A brief, one-sentence description of what it is and why it's awesome.
+
+Here's the format to follow:
+`[Project Name](link) - A short description.`
+
+## What Happens Next?
+
+Once you've submitted your suggestion, a maintainer will review it. This allows us to ensure everything on the list is high-quality, relevant, and well-documented. If your suggestion is approved, a maintainer will add it to the list.
+
+## Guideline for a Great Suggestion
+
+To ensure your suggestion gets added quickly, please make sure it meets the following criteria:
+
+-   **It's relevant:** The resource is directly related to opencode.
+-   **It's awesome:** It's a useful, high-quality, and well-maintained project.
+-   **It's not a duplicate:** Please check the list to make sure your suggestion isn't already there.
+
+That's it! We look forward to seeing your suggestions. Thank you for helping build this community resource