feat: clone from https://github.com/miquels/webdav-server-rs

fs_quota/README.md

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+
+# fs-quota
+
+Get filesystem disk space used and available for a unix user.
+
+This crate has support for:
+
+- the Linux quota system
+- NFS quotas (via SUNRPC).
+- `libc::vfsstat` lookups (like `df`).
+
+Both the `quota` systemcall and `vfsstat` systemcall are different
+on every system. That functionality is only implemented on Linux
+right now. NFS quota support _should_ work everywhere.
+
+NFS quota support can be left out by disabling the `nfs` feature.
+
+Example application:
+```rust
+use fs_quota::*;
+
+fn main() {
+    let args: Vec<String> = std::env::args().collect();
+    if args.len() < 2 {
+        println!("usage: fs_quota <path>");
+        return;
+    }
+    println!("{:#?}", FsQuota::check(&args[1], None));
+}
+```
+
+### Copyright and License.
+
+ * © 2018, 2019 XS4ALL Internet bv
+ * © 2018, 2019 Miquel van Smoorenburg
+ * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)