add pre-prequisites doc

prerequisites/README.md

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+# Pre-requisites for Camel
+
+To run the provided examples, you would need:
+- Java 8
+- Maven
+
+## Java
+
+Camel requires Java 8 ([Java 9 is currently being tested and Java 10 is out-of-scope](http://camel.apache.org/camel-2200-release.html)).
+Make sure your java version is correct by running:
+```
+$ java -version
+java version "1.8.0_131"
+Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
+Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
+```
+
+If you do not have Java installed, on MacOS you can use [Brew](https://brew.sh/) to install Java:
+```
+brew tap caskroom/versions
+brew cask install java8
+```
+
+If you have a Fedora/CentOS/RHEL, you can install OpenJDK:
+```
+sudo yum install java-1.8.0-openjdk-devel
+```
+
+## Maven
+
+Make sure [Maven](https://maven.apache.org/) is installed:
+```
+$ mvn -version
+Apache Maven 3.5.0 (ff8f5e7444045639af65f6095c62210b5713f426; 2017-04-03T21:39:06+02:00)
+Maven home: /usr/local/Cellar/maven/3.5.0/libexec
+Java version: 1.8.0_131, vendor: Oracle Corporation
+Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre
+Default locale: en_US, platform encoding: UTF-8
+OS name: "mac os x", version: "10.13.4", arch: "x86_64", family: "mac"
+```
+
+If you do not have Maven installed, on MacOS you can install it with Brew:
+```
+brew install maven
+```
+
+On Fedora/CentOS/RHEL, you can install it from the optional repo:
+```
+sudo yum install maven
+```