Update readme

README.md

@@ -27,7 +27,9 @@ talk to the server.
   [RustCrypto/ChaCha20Poly1305](https://github.com/RustCrypto/AEADs/tree/master/chacha20poly1305)
 
 Additionally, the core of the distant client and server codebase can be pulled
-in to be used with your own Rust crates via the `distant-core` crate.
+in to be used with your own Rust crates via the `distant-core` crate. The
+networking library, which is agnostic of `distant` protocols, can be used via
+the `distant-net` crate.
 
 ## Installation
 
@@ -48,6 +50,41 @@ cargo install distant
 Alternatively, you can clone this repository and build from source following
 the [build guide](./BUILDING.md).
 
+## Backend Feature Matrix
+
+Distant supports multiple backends to facilitate remote communication with
+another server. Today, these backends include:
+
+* `distant` - a standalone server acting as the reference implementation
+* `ssh` - a wrapper around an `ssh` client that translates the distant protocol
+  into ssh server requests
+
+Not every backend supports every feature of distant. Below is a table outlining
+the available features and which backend supports each feature:
+
+| Feature               | distant | ssh |
+| --------------------- | --------| ----|
+| Capabilities          | ✅      | ✅  |
+| Filesystem I/O        | ✅      | ✅  |
+| Filesystem Watching   | ✅      | ✅  |
+| Process Execution     | ✅      | ✅  |
+| Search                | ✅      | ❌  |
+| System Information    | ✅      | ⚠  |
+
+* ✅ means full support
+* ⚠ means partial support
+* ❌ means no support
+
+### Feature Details
+
+* `Capabilities` - able to report back what it is capable of performing
+* `Filesystem I/O` - able to read from and write to the filesystem
+* `Filesystem Watching` - able to receive notifications when changes to the
+  filesystem occur
+* `Process Execution` - able to execute processes
+* `Search` - able to search the filesystem
+* `System Information` - able to retrieve information about the system
+
 ## Example
 
 ### Starting the manager