docs: Update README

README.md

@@ -1,16 +1,29 @@
 # Warp4j
 
-Turn Java application into self-contained executable. 
+Turn JAR (java application archive) into self-contained executable. 
 
 ## Features
 
-- automatically downloads JDKs
+- automatically downloads java runtimes
-- creates custom runtimes optimized for your application
+- creates runtimes optimized for your application
 - creates self-contained binaries for Linux, MacOS and Windows using [warp-packer](https://github.com/dgiagio/warp)
 
+## TL;DR
+
+Just put both `warp4j` and `warp-packer` somewhere in your PATH and run `warp4j app.jar`.
+
 ## Install
 
-TODO
+First install [warp-packer](https://github.com/dgiagio/warp/releases) and ensure other common tools available: `curl`, `awk`, `sed`. Then install `warp4j` like this:
+
+```bash
+$ LOCATION=/usr/local/bin \
+LINK=https://raw.githubusercontent.com/guziks/warp4j/master/warp4j \
+TEMP_LOCATION=/tmp/warp4j \
+curl -fsSL -o $TEMP_LOCATION $LINK && \
+chmod 755 $TEMP_LOCATION && \
+sudo mv $TEMP_LOCATION $LOCATION/warp4j
+```
 
 ## Usage
 
@@ -29,23 +42,50 @@ warped
 
 $ ls warped
 my-app-linux
-my-app.linux-x64.tar.gz
+my-app-linux-x64.tar.gz
-my-app-osx
+my-app-macos
-my-app.osx-x64.tar.gz
+my-app-macos-x64.tar.gz
 my-app-windows.exe
-my-app.windows-x64.zip
+my-app-windows-x64.zip
 ```
 
 See help:
 
 ```bash
 $ wapr4j --help
+
+Usage: warp4j [options] <app.jar>
+
+Turn JAR (java application archive) into self-contained executable
+
+Options:
+  -j, --java-version   <version>
+                       override JDK/JRE version
+                       examples: "11", "11.0", "11.0.2", "11.0.2+9"
+                       default: 11
+  --no-optimize        use JRE instead of optimized JDK
+                       by default jdeps and jlink are used to create
+                       optimized JDK for the partiular jar,
+                       JRE is always used for java 8
+  --pull               check if more recent JDK/JRE distro is available
+                       by default latest cached version that matches
+                       "--java-version" is used
+  --target-linux       create binary for Linux
+  --target-macos       create binary for macOS
+  --target-windows     create binary for Windows
+                       if no targets specified then create for all
+  --jvm-impl           jvm implementation: hotspot or openj9
+                       default: hotspot
+  --jvm-options        <options>
+                       passed to java like this:
+                       "java <options> -jar <jar file>"
+  -h, --help           show this help
 ```
 
 ## Cache Location
 
-Downloaded JDKs and prepared bundles are here:
+Downloaded runtimes and prepared bundles are here:
 
-```bash
+- Linux: `$HOME/.local/share/warp4j`
-$HOME/.local/share/warp4j/
+- macOS: `$HOME/Library/Application Support/warp4j`
-```
+- Windows: `%LOCALAPPDATA%\warp4j`