update tools/fileserver

tools/fileserver/tools/FreeFileSync/FreeFileSync.md

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+# FreeFileSync
+
+[https://freefilesync.org/](https://freefilesync.org/)
+
+
+> Synchronize Files and Folders
+Key featuresFreeFileSync is a folder comparison and synchronization software that creates and manages backup copies of all your important files. Instead of copying every file every time, FreeFileSync determines the differences between a source and a target folder and transfers only the minimum amount of data needed. FreeFileSync is Open Source software, available for Windows, macOS, and Linux.
+

tools/fileserver/tools/FreeFileSync/README.md

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+# README
+
+
+FreeFileSync
+

tools/fileserver/tools/Syncthing/README.md

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+# README
+

tools/fileserver/tools/foldersync/FolderSync.md

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+# FolderSync
+
+[https://foldersync.io/](https://foldersync.io/)
+
+
+> Easy and powerful syncing for Android and Desktop
+> FolderSync is the ultimate file syncing and backup solution for Android, Windows, MacOS and Linux users. With its easy-to-use interface and powerful features, you can easily keep your files and folders in sync across your devices and cloud storage services.
+>
+
+
+windows/Linux/MacOS 下是收费软件。
+android 有免费和收费版软件。

tools/fileserver/tools/foldersync/README.md

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+# README
+