Create README.md

Author: kazuki0824

README.md

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+# rclcpp_components_template
+
+## How to use
+1. Replace all `pkgname` in the filename with the name you want to use.
+2. In CMakeLists.txt and packages.xml, modify these lines as you like.
+https://github.com/OUXT-Polaris/rclcpp_components_template/blob/ab1cf5c405108a3c25f3b2f8eeaee3118a9d56a2/CMakeLists.txt#L2-L3
+https://github.com/OUXT-Polaris/rclcpp_components_template/blob/ab1cf5c405108a3c25f3b2f8eeaee3118a9d56a2/package.xml#L4-L8