docs: more documentation on prebuilt binaries all-editors-wise

Author: Veetaha

docs/user/README.md

@@ -1,16 +1,26 @@
+[github-releases]: https://github.com/rust-analyzer/rust-analyzer/releases
+
 The main interface to rust-analyzer is the
 [LSP](https://microsoft.github.io/language-server-protocol/) implementation. To
-install lsp server, clone the repository and then run `cargo xtask install
---server` (which is shorthand for `cargo install --path
-./crates/ra_lsp_server`). This will produce a binary named `ra_lsp_server` which
-you should be able to use it with any LSP-compatible editor. We use custom
-extensions to LSP, so special client-side support is required to take full
-advantage of rust-analyzer. This repository contains support code for VS Code.
-
-```
+install lsp server, you have three options:
+
+* **Preferred and default:** install the plugin/extension for your IDE and it will ask your permission to automatically download the latest lsp server for you from [GitHub releases][github-releases]. (See docs to find out whether this is implemented for your editor below).
+* Manually download prebuilt binaries from [GitHub releases][github-releases]
+    * `ra_lsp_server-linux` for Linux
+    * `ra_lsp_server-mac` for Mac
+    * `ra_lsp_server-windows.exe` for Windows
+* Clone the repository and build from sources
+```bash
 $ git clone [email protected]:rust-analyzer/rust-analyzer && cd rust-analyzer
-$ cargo xtask install --server
+$ cargo xtask install --server # or cargo install --path ./crates/ra_lsp_server
 ```
+
+This way you will get a binary named `ra_lsp_server` (with os suffix for prebuilt binaries)
+which you should be able to use with any LSP-compatible editor.
+
+We make use of custom extensions to LSP, so special client-side support is required to take full
+advantage of rust-analyzer. This repository contains support code for VS Code.
+
 Rust Analyzer needs sources of rust standard library to work, so
 you might also need to execute
 
@@ -22,30 +32,38 @@ See [./features.md](./features.md) document for a list of features that are avai
 
 ## VS Code
 
-Prerequisites:
+### Prerequisites
 
-In order to build the VS Code plugin, you need to have node.js and npm with
-a minimum version of 10 installed. Please refer to
-[node.js and npm documentation](https://nodejs.org) for installation instructions.
-
-You will also need the most recent version of VS Code: we don't try to
+You will need the most recent version of VS Code: we don't try to
 maintain compatibility with older versions yet.
 
+In order to build the VS Code plugin from sources, you need to have node.js and npm with
+a minimum version of 12 installed. Please refer to
+[node.js and npm documentation](https://nodejs.org) for installation instructions.
+
 ### Installation from prebuilt binaries
 
 We ship prebuilt binaries for Linux, Mac and Windows via
-[GitHub releases](https://github.com/rust-analyzer/rust-analyzer/releases).
+[GitHub releases][github-releases].
 In order to use them you need to install the client VSCode extension.
 
-Publishing to VSCode marketplace is currently WIP. Thus, you need to clone the repository and install **only** the client extension via
+Publishing to VS Code marketplace is currently WIP. Thus, you need to manually download
+`rust-analyzer-0.1.0.vsix` file from latest [GitHub release][github-releases].
+
+After you downloaded the `.vsix` file you can install it from the terminal
+
 ```
-$ git clone https://github.com/rust-analyzer/rust-analyzer.git --depth 1
-$ cd rust-analyzer
-$ cargo xtask install --client-code
+$ code --install-extension rust-analyzer-0.1.0.vsix
 ```
-Then open VSCode (or reload the window if it was already running), open some Rust project and you should
-see an info message pop-up.
 
+Or open VS Code, press <kbd>Ctrl+Shift+P</kbd>, and search for the following command:
+
+<img width="500px" alt="Install from VSIX command" src="https://user-images.githubusercontent.com/36276403/74108225-c0c11d80-4b80-11ea-9b2a-0a43f09e29af.png">
+
+Press <kbd>Enter</kbd> and go to `rust-analyzer-0.1.0.vsix` file through the file explorer.
+
+Then open some Rust project and you should
+see an info message pop-up.
 
 <img height="140px" src="https://user-images.githubusercontent.com/36276403/74103174-a40df100-4b52-11ea-81f4-372c70797924.png" alt="Download now message"/>