📚 Add README

Author: faldyif

README.md

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+# Env Diff
+A tool that used for comparing environment variable file.
+
+## How To Install
+```bash
+npm install
+npm run build
+```
+Then, it will generate executable output on ./bin folder that you can move or link to your $PATH directory.
+
+## How To Run
+Just run the executable, if you have already copied or registered the executable on your $PATH, simply run the command below inside the directory you want to check the .env and another .env file you want to compare.
+```bash
+env-diff
+```