Rename to btest-rs, add LICENSE and README with full credits

- Rename package to btest-rs (Rust convention for reimplementations)
- MIT license matching the original btest-opensource license
- LICENSE explicitly credits Alex Samorukov's original work
- Comprehensive README with usage, performance numbers, and credits
- CLI --help references the original project

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -82,6 +82,22 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "btest-rs"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "bytes",
+ "clap",
+ "md-5",
+ "rand",
+ "socket2 0.5.10",
+ "thiserror",
+ "tokio",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "bytes"
 version = "1.11.1"
@@ -255,22 +271,6 @@ version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8ca58f447f06ed17d5fc4043ce1b10dd205e060fb3ce5b979b8ed8e59ff3f79"
 
-[[package]]
-name = "mikrotik-btest"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "bytes",
- "clap",
- "md-5",
- "rand",
- "socket2 0.5.10",
- "thiserror",
- "tokio",
- "tracing",
- "tracing-subscriber",
-]
-
 [[package]]
 name = "mio"
 version = "1.2.0"