Improve/cleanup the README

README.md

-# redoxfs
-The Redox Filesystem. Compatible with Redox and Linux.
+# RedoxFS
+
+This is the default filesystem of Redox OS inspired by [ZFS](https://docs.freebsd.org/en/books/handbook/zfs/) and adapted to a microkernel architecture.
+
+(It's a replacement for [TFS](https://gitlab.redox-os.org/redox-os/tfs))
+
+Current features:
+
+- Compatible with Redox and Linux
+- Copy-on-write
+- Data/metadata checksums
+- Transparent encryption
+- Standard Unix file attributes
+- File/directory size limit up to 193TiB (212TB)
+- File/directory quantity limit up to 4 billion per 193TiB (2^32 - 1 = 4294967295)
+- MIT licensed
+- Disk encryption fully supported by the Redox bootloader, letting it load the kernel off an encrypted partition.
+
+Being MIT licensed, RedoxFS can be added on GPL kernels (Linux, for example).
 
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