Add REUSE.toml file for source code of rustc-perf

Author: Kobzol

LICENSES/MIT.txt

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+MIT License
+
+Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

REUSE.toml

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+version = 1
+
+# Reuse annotations file.
+#
+# This file controls how reuse-tool finds copyright and license notices within
+# source files. As the tool has a habit of picking up random uses of the word
+# 'Copyright' within source code, and because it will complain that other files
+# do not contain any specific copyright and license notifications, we usually
+# just set a blanket license and copyright notice for a whole sub-tree at a
+# time.
+#
+# See https://reuse.software and https://github.com/fsfe/reuse-tool for more
+# details. We currently use reuse-tool version 4.0.3.
+
+[[annotations]]
+path = [
+    "ci/**",
+    "collector/**",
+    "database/**",
+    "docs/**",
+    "intern/**",
+    "site/**",
+    "triage/**",
+    ".github/**",
+    "Cargo.lock",
+    "Cargo.toml",
+    "Dockerfile",
+    "LICENSE.md",
+    "README.md",
+    "REUSE.toml",
+    ".gitignore",
+    ".dockerignore"
+]
+SPDX-FileCopyrightText = "The Rust Project Developers (see https://thanks.rust-lang.org)"
+SPDX-License-Identifier = "MIT"