add readme, license and actions

.github/workflows/build_and_release.yml

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+name: build_and_release
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: build
+      run: cargo build --release
+    - name: release
+      uses: softprops/action-gh-release@v1
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        files: |
+          target/release/pk-crypt
+          target/release/pk-crypt.exe

LICENSE

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+MIT License
+
+Copyright (c) 2023 KaDw
+
+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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+# pk-crypt
+
+## Introduction
+
+CLI tool to decrypt and encrypt `.pk` files that are part of configuration files for KalOnline game.
+
+## Usage
+
+`pk-crypt [OPTIONS] <MODE>`
+
+### Options
+
+* -p, --password <PASSWORD> - .pk password [default: `EV)O8@BL$3O2E`]
+* -x, --xor <XOR> - Xor decrypt/encrypt key (decimal), range of this value is dependent on DECRYPT/ENCRYPT lookup tables [default: `47`]
+* -f, --file <FILE> - File to be decrypted/encrypted. Files will be decrypted to {filename}_decrypted. The same folder is used as input in encrypt mode [default: `config.pk`]
+* -h, --help - Print help (see a summary with '-h')
+* -V, --version - Print version
+
+### Modes
+
+* decrypt
+* encrypt
+
+## Example usage
+
+### Decrypt
+
+`pk-cypt.exe decrypt --file config.pk --password abcd1234 --xor 45`
+
+### Encrypt
+
+`pk-cypt.exe encrypt --file config.pk --password abcd1234 --xor 45`