Add Client Well-Known docs.

docs/client_well_known.md

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+# Client Well-Known
+
+| Status | Last updated |
+|--|--|
+| Draft | September 27, 2023 |
+
+<hr />
+
+
+
+## Jitsi Configuration
+
+Jitsi configuration is keyed by `io.element.jitsi`. The following options are supported:
+
+| Key | Type | 🤖 | 🍎 | 🕸️ | Description |
+| - | - | - | - | - | - |
+| `preferredDomain` | `String` | ❓ | ✅ | ❌ | Use the specified server for Jitsi calls. |
+| `useFor1To1Calls` | `Bool` | ❓ | ✅ | ❌ | Use Jitsi for 1:1 calls (by default we use native Matrix calls). |
+
+## Encryption Configuration
+
+Encryption configuration is keyed by `io.element.e2ee`. The following options are supported:
+
+| Key | Type | 🤖 | 🍎 | 🕸️ | Description |
+| - | - | - | - | - | - |
+| `default` | `Bool` | ❓ | ✅ | ✅ | Indicate if E2EE is enabled by default. |
+| `force_disable` | `Bool` | ❓ | ❌ | ✅ | Overrides `default` when true, removing the option to enable encryption throughout the UI (existing encrypted rooms are unaffected). |
+| `secure_backup_required` | `Bool` | ❓ | ✅ | ✅ | Indicate if secure backup (SSSS) is mandatory. |
+| `secure_backup_setup_methods` | `BackupSetupMethod` | ❓ | ✅ | ✅ | Methods to use to setup secure backup (SSSS). |
+| `outbound_keys_pre_sharing_mode` | `KeyPreSharingStrategy` | ❓ | ✅ | ❌ | Outbound keys pre sharing strategy. |
+
+### Encryption Configuration Types
+
+```
+enum BackupSetupMethod: Int {
+    case passphrase = 0
+    case key = 1
+}
+```
+
+```
+enum KeyPreSharingStrategy: Int {
+    case none = 0,
+    case whenEnteringRoom = 1,
+    case whenTyping = 2
+}
+```