Add style guide for Infrastructure site and docs.

content/style_guide.md

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+---
+title: Style guide
+---
+# Style guide
+
+Recommended conventions for written communication and canonical terms in the Infrastructure project documentation.
+
+## Markup language
+
+Markdown is the preferred markup language for site contents and documentation.
+
+### Semantic line breaks
+
+Unless content is intended to be rendered as GitHub-flavored Markdown (GFM), use one sentence per line (sometimes called "semantic line breaks") to support easier review with diff-based source code version control.
+
+## Typography
+
+### Sentence case for titles
+
+Use "sentence case" for titles: Capitalize a title as you would a sentence in English.
+Sentence case titles may still have multiple capitalized words.
+For example if each word of the title is part of a proper noun such as "Open Robotics Infrastructure Project" each word of the title is capitalized.
+
+## Terminology
+
+* __Infrastructure project__: The Infrastructure project is an OSRF project for which management has been assigned to the OSRA.
+  When the Open Robotics / OSRF / OSRA context is clear use "the Infrastructure Project" and otherwise use "the Open Robotics Infrastructure Project".
+  When referring to the formal charted body, capitalize "Infrastructure Project" but when referring to the project as a collective organization or effort leave project uncapitalized.
+  Examples:
+    - The Infrastructure project is preparing to transition all server infrastructure to Ubuntu 22.04.
+    - A new project representative from the Infrastructure Project must be appointed.
+
+* __Build farm__: Prefer the two word "build farm" to the compound "buildfarm" except when referring to project / repository names that use the compound word such as `cookbook-ros-buildfarm` or `ros_buildfarm`.