diff --git a/CHANGELOG.md b/CHANGELOG.md
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+++ b/CHANGELOG.md
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+# Changelog
+
+## [0.0.1] - 2024-03-26
+
+### Added
+
+- Run single file/source using the same command.
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diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+MIT License
+
+Copyright (c) 2024 Jin Real
+
+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.
diff --git a/Readme.md b/Readme.md
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+++ b/Readme.md
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+A runtime utility that simplify basic operations of language runtimes in linux.
+
+# Language Runtime Support
+|language/runtime|comment|
+|-|-|
+|gcc||
+|g++||
+|go||
+|nodejs||
+|python||
+
+# Install
+1. Download:
+```
+wget https://raw.githubusercontent.com/jinreal/rtutil/main/rt
+```
+2. Make `rt` executable:
+```
+chmod +x rt
+```
+3. Copy `rt` to binary directory(e.g. `/usr/local/bin`):
+```
+cp rt BINARY_DIRECTORY
+```
+
+# Usage
+Run a c file:
+```
+rt main.c
+```
+
+Run a c++ file:
+```
+rt main.cc
+```
+
+Run a go file (project must be initialized using `go mod init`):
+```
+rt main.go
+```
+
+Run a node.js file:
+```
+rt main.js
+```
+
+Run a python file:
+```
+rt main.py
+```
+
+# Test Language Runtime & System
+|language/runtime|version|
+|-|-|
+|gcc|12.2.0|
+|g++|12.2.0|
+|go|1.19.8|
+|nodejs|20.11.1|
+|python|3.11.2|
+
+__system__: MX 23.2 (Debian GNU/Linux 12, kernel=6.1.0-17-amd64)
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diff --git a/rt b/rt
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+++ b/rt
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+bin="echo"
+params=("\"Invalid command.\"")
+epilogue=()
+
+if [[ "$1" == *.c ]]; then
+  bin="gcc"
+  params=("$1")
+  epilogue=("./a.out")
+elif [[ "$1" == *.cc ]]; then
+  bin="g++"
+  params=("$1")
+  epilogue=("./a.out")  
+elif [[ "$1" == *.go ]]; then
+  bin="go"
+  params=("run" "$1")
+elif [[ "$1" == *.js ]]; then
+  bin="node"
+  params=("$1")
+elif [[ "$1" == *.py ]]; then
+  bin="python"
+  params=("$1")
+fi
+
+# run command
+mainCmd="$bin"
+for el in "${params[@]}"; do
+    mainCmd+=" $el"
+done
+eval "$mainCmd"
+
+if [ ${#epilogue[@]} -eq 0 ]; then
+    exit
+fi
+
+# run epilogue
+epilogueCmd=""
+for el in "${epilogue[@]}"; do
+    epilogueCmd+="$el "
+done
+eval "$epilogueCmd"
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