initial commit

- add README which includes the purpose of this project;
- include copyright notice and MIT license;
- add empty Cargo project.

.gitignore

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+target/

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "toy_cpu_4bit"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "toy_cpu_4bit"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

LICENSE

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+Copyright Murad Karammaev, Nikita Kuzmin
+
+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.

README.md

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+# ToyCPU-4bit
+
+This incredibly small CPU is a learning project.
+During implementation of this CPU, we are expected to learn how to:
+- design ISA in general;
+- implement instruction decoding;
+- impement instruction execution;
+- visualize CPU during its work.

src/main.rs

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+// SPDX-License-Identifier: MIT
+// Copyright Murad Karammaev, Nikita Kuzmin
+
+fn main() {}