Add description for the Microkernel devroom (#274)

Signed-off-by: Udo Steinberg <[email protected]>

content/schedule/devrooms/microkernel.html

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+<h3>About Microkernels</h3>
+<p>
+Microkernels are kernels that provide only simple generic mechanisms
+suitable for outsourcing the traditional operating-system functionality to
+deprivileged user-mode processes in a component-based OS that runs on top. 
+Microkernel-based operating systems come in many different flavors, each
+having a distinctive set of goals, features, mechanisms and trade-offs. 
+Some of the most frequently cited reasons for structuring the system as a
+microkernel are security, modularity, flexibility, verifiability and
+fault tolerance. Many microkernels can also act as a hypervisor.
+</p>
+<p><b>
+See <a href="https://www.microkernel.info/">https://www.microkernel.info/</a>
+for a comprehensive list of open-source microkernel projects.
+</b></p>
+<h3>About the Devroom</h3>
+<p>
+The microkernel and component-based OS devroom brings the creative minds
+behind several open-source projects together and offers enthusiasts a chance
+to discuss novel ideas and get up to speed with the latest developments in
+the various groups.
+Since the first Microkernel OS Devroom at FOSDEM 2012, this devroom has been
+a part of each following FOSDEM (with slight variations of the name).
+The focus gradually widened to include component-based, unikernel-based and
+other operating systems.
+</p>