Add README

README.md

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+# nenv
+
+Node environment manager written in rust.
+
+
+## Installation
+
+Figure out how to install it yourself (for now).
+Add the nenv `bin` directory to your PATH variable.
+
+## Usage
+
+### Install node versions
+
+```sh
+# install the latest available node version
+nenv install latest
+
+# install the latest lts version
+nenv install lts
+
+# install the latest 14.x.x version.
+nenv install 14
+```
+
+### Change the system-wide default version
+
+```sh
+nenv default latest
+```
+
+### Refresh installed binaries and upstream versions
+
+```sh
+nenv refresh
+```
+
+
+## License
+
+GPL-3.0