Prepare CLI for move into mainline

packages/cli/docs/src/installation.md

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+# Installation
+
+Choose any one of the methods below to install the Dioxus CLI:
+
+## Install from latest git version
+
+To get the most up to date bug fixes and features of the Dioxus CLI, you can install the development version from git.
+
+```
+cargo install --git https://github.com/Dioxuslabs/cli
+```
+
+This will automatically download `Dioxus-CLI` source from github master branch,
+and install it in Cargo's global binary directory (`~/.cargo/bin/` by default).
+
+## Install from `crates.io` version
+
+The published version of the Dioxus CLI is updated less often, but should be more stable than the git version of the Dioxus CLI.
+
+```
+cargo install dioxus-cli
+```