docs: Add download links, screenshots and a feature list to the README

README.md

@@ -17,6 +17,33 @@ its search-everything habits — to a native app with a Rust core.
 Editor, code insight, debugger, Git, terminal, database and HTTP clients,
 for 60+ languages.
 
+## Download
+
+Installers for macOS (Apple Silicon and Intel), Windows and Linux (`.deb`, `.rpm`,
+AppImage) are on the [latest release](https://github.com/l0ng-ai/openidea/releases/latest).
+The app updates itself from GitHub releases.
+
+## Screenshots
+
+![Editor with rust-analyzer inlay hints](docs/media/editor.jpg)
+
+| | |
+|---|---|
+| ![Search Everywhere](docs/media/search-everywhere.jpg) | ![Debugger stopped at a breakpoint](docs/media/debug.jpg) |
+
+## Features
+
+- **IntelliJ habits**: the IDEA keymap (macOS and Windows), Search Everywhere on double Shift,
+  Goto File / Symbol / Action, tool windows on side stripes.
+- **Code insight**: completion, navigation, usages, inlay hints and diagnostics over LSP;
+  languages are plain TOML files in [`languages/`](languages).
+- **Run and debug**: run configurations, a DAP debugger with inline values, test runner,
+  coverage and profiler views.
+- **Git and GitHub**: commit, stash, branches, log with graph, diffs, pull requests.
+- **Tools**: terminal with split panes, database client, HTTP client, Docker services, TODO view.
+- **Plugins**: sandboxed WebAssembly components (wasmtime, WASI preview 2), see
+  [`plugins/`](plugins/README.md).
+
 ## Benchmark
 
 Opening [freqtrade](https://github.com/freqtrade/freqtrade) (Python, ~770 files)