add usage instructions

docs/use.md

@@ -0,0 +1,61 @@
+In developing `tfversion`, our 2 focus points are simplicity and ensuring a smooth user experience, enabling you to effortlessly use Terraform on any platform.
+
+### Install the latest stable release
+
+```sh
+tfversion install --latest
+```
+
+### Install a specific version
+
+```sh
+tfversion install 1.7.4
+```
+
+### Install the latest pre-release
+
+```sh
+tfversion install --latest --pre-release
+```
+
+### Use the latest stable release
+
+```sh
+tfversion use --latest
+```
+
+### Use a specific version
+
+```sh
+tfversion use 1.7.4
+```
+
+### Use the latest pre-release
+
+```sh
+tfversion use --latest --pre-release
+```
+
+### Use the required version for your current directory
+
+```sh
+tfversion use --required
+```
+
+### List all available versions
+
+```sh
+tfversion list
+```
+
+### List all installed versions
+
+```sh
+tfversion list --installed
+```
+
+### Uninstall a specific version
+
+```sh
+tfversion uninstall 1.7.4
+```