Add Rust optic

rust.optic

@@ -0,0 +1,23 @@
+DiscardNonMatching;
+
+/*
+    Sites relvant to the Rust programming language
+*/
+
+Rule {
+    Matches {
+        Site("|lib.rs|")
+    },
+    Matches {
+        Domain("|docs.rs|")
+    },
+    Matches {
+        Domain("|crates.io|")
+    },
+    Matches {
+        Domain("|rust-lang.org|")
+    },
+    Matches {
+        Domain("|rustup.rs|")
+    },
+};