add presentation slide deck for lightning talk.

Signed-off-by: Tomoya.Fujita <Tomoya.Fujita@sony.com>

presentation/ros2_parameter_server.md

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+---
+marp: true
+theme: default
+header: "__ROS 2 Persistent Parameter Server__"
+footer: "[fujitatomoya@github](https://github.com/fujitatomoya)"
+---
+
+## [ROS 2 Persistent Parameter Server](https://github.com/fujitatomoya/ros2_persist_parameter_server)
+
+![bg right:35% width:300px](../images/QR.png)
+
+- inspired by ROS 1 parameter server.
+- can set/get any parameters in this global server.
+- can save/load the parameters in storage.
+
+
+<!---
+Comment Here
+--->
+
+---
+
+![bg 70%](https://images.squarespace-cdn.com/content/v1/606d378755a86f589aa297b7/1653397531343-6M4IQ4JWDQV1SQ8W17UN/HumbleHawksbill_TransparentBG-NoROS.png)
+![bg 70%](https://images.squarespace-cdn.com/content/v1/606d378755a86f589aa297b7/1684793822030-O5GLQ81TY0M8RZ7I422Q/IronIrwiniLogo.jpg?format=750w)
+![bg 70%](https://images.squarespace-cdn.com/content/v1/606d378755a86f589aa297b7/1628726028642-TVRVRIQL914IVYWV8MG9/rolling.png)
+
+<!---
+Supported platforms
+--->
+
+---
+
+## Why we need this?
+
+- Global configuration that many nodes share (e.g. RTOS priorities, vehicle dimensions, …)
+- Generic ROS 2 system or localhost wide parameter server.
+- <span style="color:red;">Persistent storage support to re-initialize the system.</span>
+ - **parameters are modified in runtime and cached into persistent volume as well. and next boot or next re-spawn, modified parameters will be loaded at initialization. (parameter lifetime is dependent on use case, sometimes system lifetime, sometimes node lifetime.)**
+- Using ROS 1 based application with Parameter Server.
+
+<!---
+Comment Here
+--->
+
+---
+
+![bg 90%](../images/overview_architecture.png)
+
+---
+
+## Issues and PRs are always welcome 🚀
+
+https://github.com/fujitatomoya/ros2_persist_parameter_server
+
+![bg left:35% width:300px](../images/QR.png)
+
+<!---
+Comment Here
+--->