docs: add README.md file

README.md

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+# Licensmith
+
+Effortlessly craft the perfect LICENSE for your Git repo in seconds with a single command!
+
+## Usage
+This command will generate ISC `LICENSE` file in your current directory, including current year, and your name read from Git configuration:
+```bash
+licensmith --license ISC
+```
+
+By default, Licensmith read your local repository looking for user details (name and e-mail), as a fallback it uses global configuration.
+
+You can also specify different values using:
+```bash
+licensmith --license ISC --name "John Doe" --email "jdoe@example.com"
+```
+
+To list available templates run:
+```bash
+licensmith --list
+```