README.{header,footer}.md: extract into segments

README.disabled.header.md

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+These checks are not enabled. Notes are included for each explaining why.

README.disabled.sevntu.header.md

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+As the sevntu check are considered experimental not all those that are not enabled are listed here. Only where they are disabled due to a conflict with my 'style' or there is another irreconcilable difference that prevents them from being enabled, will they be documented to prevent repeated investigations.

README.enabled.header.md

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+The following is a list of each of the checks and the expectations each has on your code.

README.footer.md

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+[Effective Java]: http://amzn.to/2aSz6GE

README.header.md

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+# kemitix-checkstyle-ruleset
+
+Provides an extensive Checkstyle ruleset for use with Apache's `maven-checkstyle-plugin`.
+
+The ruleset includes checks from both the core Checkstyle library and from the Sevntu-Checkstyle library.
+
+* [Requirements](#requirements)
+* [Usage](#usage)
+* [All Checks](#all-checks)
+* [Enabled Checks](#enabled-checks)
+    * [Checkstyle](#checkstyle)
+    * [Sevntu](#sevntu)
+* [Disabled Checks](#disabled-checks)
+    * [Checkstyle](#checkstyle-1)
+    * [Sevntu](#sevntu-1)
+
+## Requirements
+
+* [maven-checkstyle-plugin](https://maven.apache.org/plugins/maven-checkstyle-plugin/) 2.17+
+* [Checkstyle](http://checkstyle.sourceforge.net/) 7.0+
+* [Sevntu-checkstyle](http://sevntu-checkstyle.github.io/sevntu.checkstyle/) 1.21.0+
+
+## Usage
+
+To use this ruleset in your `maven-checkstyle-plugin` configuration add `checkstyle`, `sevntu-checkstyle-maven-plugin` and `kemitix-checktyle-ruleset` as dependencies of the `maven-checkstyle-plugin`.
+
+You need to include `checkstyle` as the version bundled with the `maven-checkstyle-plugin` is not up-to-date enough.
+
+````
+<properties>
+    <checkstyle.version>7.0</checkstyle.version>
+    <sevntu-checkstyle-maven-plugin.version>1.21.0</sevntu-checkstyle-maven-plugin.version>
+    <kemitix-checkstyle-ruleset.version>0.1.1</kemitix-checkstyle-ruleset.version>
+</properties>
+<pluginManagement>
+    <plugins>
+        <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-checkstyle-plugin</artifactId>
+            <dependencies>
+                <dependency>
+                    <groupId>com.puppycrawl.tools</groupId>
+                    <artifactId>checkstyle</artifactId>
+                    <version>${checkstyle.version}</version>
+                </dependency>
+                <dependency>
+                    <groupId>com.github.sevntu.checkstyle</groupId>
+                    <artifactId>sevntu-checkstyle-maven-plugin</artifactId>
+                    <version>${sevntu-checkstyle-maven-plugin.version}</version>
+                </dependency>
+                <dependency>
+                    <groupId>net.kemitix</groupId>
+                    <artifactId>kemitix-checkstyle-ruleset</artifactId>
+                    <version>${kemitix-checkstyle-ruleset.version}</version>
+                </dependency>
+            </dependencies>
+            <configuration>
+                <configLocation>net/kemitix/checkstyle.xml</configLocation>
+            </configuration>
+        </plugin><!-- maven-checkstyle-plugin -->
+    </plugins>
+</pluginManagement>
+<plugins>
+    <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <executions>
+            <execution>
+                <id>validate</id>
+                <phase>validate</phase>
+                <goals>
+                    <goal>check</goal>
+                    <goal>checkstyle</goal>
+                </goals>
+            </execution>
+        </executions>
+    </plugin><!-- maven-checkstyle-plugin -->
+</plugins>
+````
+
+## All Checks