ADG-235 editor guidelines

GUIDELINES.md

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+# Editor Guidelines for the «Accessibility Developer Guide»
+
+Thank you for working to enhance the content of our Guide!
+
+We try to communicate clearly and consistently. The following rules advise you to use common language conventions.
+
+Be sure to read our [Contributing Guidelines](./CONTRIBUTING.md).
+
+## Writing Style Guidelines
+
+### Language
+
+- We use British English as the standard written language.
+- We use simple language with short sentences.
+- We avoid relative clauses.
+- We avoid passive voice.
+- We use bullet points when approprioate.
+
+## Formatting
+
+- We use [Markdown](https://commonmark.org/help/) to format text.
+- 
+
+### References to Standards
+
+### Typography
+
+### Images
+
+## Code Examples
+
+TODO