Add basic CONTRIBUTING.md

CONTRIBUTING.md

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+## What we are trying to achieve
+
+The Matrix Foundation is in charge of various activities revolving around Matrix. One of the most important activities to make Matrix a mainstream protocol is lowering the barrier to entry for the general public. The Matrix.org website is a critical step of the onboarding: this is what people will stumble upon when they look up “what is Matrix chat” or “chatting on Matrix” in a search engine.
+
+**The primary mission of the matrix.org website is to onboard various populations on Matrix, and turn them into supporters of the project.**
+
+We identified 4 different kind of populations that we want to address with the Matrix.org website.
+
+- **Everyday people** who want to use Matrix for instant messaging with family and friends. They are not tech savvy and just want simple steps to follow, and something that "just works™". They don't particularly care about Matrix. They could use WhatsApp or Signal.
+- **Community managers** who want to find a platform for their community to talk on. They could use Slack or Discord.
+- **Developers** who want to create clients, servers, bridges or bots. They are tech literate and are interested in how things work from a technical perspective. They are already convinced Matrix is useful and want either to create toys for it, or Matrix-based tools for production.
+- **Entrepreneurs** who were told about Matrix and who need to see how it can bring value to them to create products based on Matrix.
+
+## How we measure progress
+
+The tools we have at our disposal are:
+
+- Privacy-preserving analytics with Plausible.io ([rationale here](https://ergaster.org/posts/2024/01/24-tracking-what-works/)). They allow us to track which are the most popular pages, custom events (e.g. to track if a call to action is often clicked on or not), and funnels
+- User feedback, which will necessarily suffer the survivor bias
+
+## How we take decisions
+
+## How to open an useful issue
+
+## How to make sure your PR is reviewed