Create README.md

Author: SamCarlberg

README.md

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+# OpenCvInstaller
+Simple application to install OpenCV.
+
+This assumes that the OpenCV artifacts are located in the FRC maven repository at `http://first.wpi.edu/FRC/roborio/maven/` or in the local maven repository.
+
+For now, this is just a CLI app with no GUI.
+
+## Supported platforms
+This currently supports
+- Windows (32- and 64-bit)
+- Mac OS X 10.4 or higher
+- Linux (32- and 64-bit)
+
+## Command line arguments
+
+Short name | Long name | Description | Argument
+---|---|---|---
+| | --help | Prints the help text | 
+-v | --version | Sets the OpenCV version | The version in the format `x.x.x` e.g. `3.1.0`
+-j | --java | Flags the Java API for install. This does _not_ install JNI bindings
+-jni | --jni | Flags the JNI bindings for install
+-h | --headers | Flags the C++ headers for install
+-n | --natives | Flags the C++ native libraries for install
+| | --all | Installs all OpenCV artifacts
+| | --no-overwrite | Do not overwrite already installed files
+
+## Usage
+```
+java -jar opencv-installer --version <version> --java --jni --headers --natives --no-overwrite
+```