starts experiments doc

.editorconfig

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+[*.md]
+# Markdown uses trailing whitespace for line breaks.
+trim_trailing_whitespace = false

EXPERIMENTS.md

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+# Experiments
+
+Here are some of the current features under development or otherwise not quite ready for release.
+
+**Important:** All features here are considered incomplete and are not supported for production servers, and may cause bugs or corruption of data. **Enable these at your own risk!**
+
+As these are incomplete features, all bug reports around these flags will be closed without comment unless we specifically note otherwise below.
+
+## Server Flags
+
+Server-side flags are enabled via the `EXPERIMENTAL_FEATURES` environment variable. Multiple flags are separated by a comma.
+
+### FASP
+
+Name: `fasp`  
+Status: Beta testing
+
+### Collections
+
+Name: `collections`  
+Status: Active development
+
+### Collections Federation
+
+Name: `collections_federation`  
+Status: Active development
+
+## Client Flags
+
+Client flags are for incomplete features in the web UI, and are enabled via inputting `localStorage.experiments = 'xyz'`. Multiple flags are separated by a comma.
+
+### Collections
+
+Name: `collections`  
+Status: Active development
+
+### Profile Redesign
+
+Name: `profile_redesign`  
+Status: Active development
+
+This is a redesign of the web UI for viewing accounts.