Project Proposal - Grandine Windows Support (#376)

* Project Proposal - Grandine Windows Support

* update the idea according to feedback

projects/grandine-windows-support.md

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+# Grandine Windows Support
+
+To support building Grandine on Windows. 
+
+If there is a suitable environment or hardware support, I also consider to add the support to other unimplemented systems or architectures, such as MacOS, BSD, ARM, RISC-V.
+
+## Motivation
+
+Grandine's developers mainly use Linux, so Grandine is tested only on Linux. However, there are many Windows and MacOS users that would benefit from better support. Furthermore, another Ethereum consensus client [Lighthouse](https://github.com/sigp/lighthouse) already supports Windows. 
+
+## Project description
+
+The goal of this project is to extend support for building Grandine, an Ethereum consensus client, on Windows. While Grandine has been primarily developed and tested on Linux, expanding its compatibility to Windows will make it more accessible to a broader range of developers and users.
+
+This project seeks to ensure that Windows users can build, run, and/or contribute to Grandine without platform-specific issues. With another Ethereum consensus client, Lighthouse, already supporting Windows, this project will make Grandine to catch up with other clients in terms of cross-OS support.
+
+## Specification
+
+1. Initial Assessment:
+
+    + Analyze the current Grandine codebase and identify the areas that require modifications for Windows compatibility.
+
+2. Development Phase:
+
+    + Modify the build system to support Windows. 
+
+3. Testing and Validation:
+
+    + Ensure all or main (if not all are suitable) tests Grandine can be passed on Windows.
+    + Fix or add some tests for Windows platform if necessary.
+
+4. Finalization and Documentation:
+
+    + Set up a Windows-based CI pipeline to automate testing.
+    + Add documentation for Windows related building and usage(if needed).
+    + Announce and support the Windows-compatible release of Grandine.
+
+## Roadmap
+
+I personally plan to complete all the tasks within two months, but the detailed timeline will be updated when the project idea is progressing.
+
+- Initial Assessment
+- Development Phase
+- Testing and Validation
+- Finalization and Documentation
+
+## Possible challenges
+
+- Dependencies and toolings Handling:
+
+    Some dependencies and toolings may be tightly coupled with Linux, requiring alternative solutions or adjustments to work on Windows.
+
+- Codes, Tests and CI Pipeline Fixing:
+
+    Codes, tests and CI pipeline fixing for Windows might involve overcoming challenges related to the understanding with current code base and platform or code specific issues. This step may be complex or simple, depending on the actual code that needs to be modified and the experience of the person doing it.
+
+- Support other unimplemented systems or architectures: 
+
+   The support to other unimplemented systems or architectures may be hard to add because of barriers to accessing these environments. 
+
+## Goal of the project
+
+By the end of EPF-5, success for this project will be defined by:
+
+The goal of this project is to successfully build Grandine on Windows at least and enable a CI pipeline for testing and release building.
+
+## Collaborators
+
+### Fellows 
+
+[MJZK](https://github.com/mjzk)
+
+### Mentors
+
+[Saulius Grigaitis](https://github.com/sauliusgrigaitis) 
+
+## Resources
+
+- [Lighthouse, an Ethereum consensus client](https://github.com/sigp/lighthouse)