GitHub: Added README.md to src and tests directory

src/README.md

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+<!--  Copyright (c) 2024 Files Community. Licensed under the MIT License. See the LICENSE.  -->
+
+# Files Source Code
+
+## Our goals
+
+Please refer to https://github.com/files-community/Files/issues/4180 for our goals.
+We are actively working on refactoring, optimizing and improving performance and codebase.
+
+- Refactoring codebase
+- Package size reduction
+- Less 3rd-party dependency
+- Less than 1% crash rate
+- Robust file system operations
+- Robust file system accessing
+- Higher storage thumbnail quality
+- Performance on multitasking
+
+## Projects
+
+Name|Language|Built with|Platform|Description
+---|---|---|---|---
+Files.App.Package<br/>Files.App (Package)|*None*|[WinAppSdk](https://learn.microsoft.com/windows/apps/windows-app-sdk)|Windows|Packaging project with [WAP](https://learn.microsoft.com/windows/apps/get-started/intro-pack-dep-proc) for `Files.App` project on Windows.
+Files.App.BackgroundTasks|C#|[CsWinRT](https://learn.microsoft.com/windows/apps/develop/platform/csharp-winrt)|Windows|In-proc background service on Windows.
+Files.App.Launcher|C++|[Win32 API](https://learn.microsoft.com/windows/win32/api)|Windows|Entry point of a process to override `Win+E` or `explorer.exe` to launch Files on Windows.
+Files.App.OpenDialog|C++|[Win32 API](https://learn.microsoft.com/windows/win32/api)|Windows|Entry point of a process to override `FileOpenDialog` common dialog on Windows.
+Files.App.SaveDialog|C++|[Win32 API](https://learn.microsoft.com/windows/win32/api)|Windows|Entry point of a process to override `FileSaveDialog` common dialog on Windows.
+Files.App.Server|C#|[CsWinRT](https://learn.microsoft.com/windows/apps/develop/platform/csharp-winrt)|Windows|Out-of-proc background service to safely continue ongoing tasks even after foreground processes are terminated. This is interoperable between the server process and Files processes using C#/WinRT projection because it's supposed to be shared by multiple Files processes.
+Files.App.Storage|C#|*None*|Windows|Implementation of Files Storage Layer on Windows.
+Files.App|C#|[WinAppSdk](https://learn.microsoft.com/windows/apps/windows-app-sdk)|Windows|Entry point and UI thread of Files on Windows.
+Files.Core.SourceGenerator|C#|*None*|Multi-platform|Source generators to boost developer experience for Files.
+Files.Core.Storage|C#|*None*|Multi-platform|Interfaces of Files Storage Layer.
+Files.Shared|C#|*None*|Multi-platform|Fundamental helpers and extensions.

tests/README.md

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+<!--  Copyright (c) 2024 Files Community. Licensed under the MIT License.  -->
+# Files Tests
+
+## Unit tests
+
+Project: **Files.UnitTests**
+
+*Still not implemeneted yet.*
+
+## Interaction tests
+
+Project: **Files.IntegerationTests**
+
+Name|Description
+---|---
+SessionTests|Verifies whether the application can be run.
+GeneralAppTests|Verifies whether the general file management elements are accessible.
+FolderCreationTests|Verifies whether a folder can be created.
+AppSettingsTests|Verifies whether the application respecitive settings page are accessible.