feat: start writing barebones documentation

API/client-server/v1/versions.md

@@ -0,0 +1,34 @@
+GET /v1/versions
+
+---
+
+## Request
+
+No request parameters or request body.
+
+---
+
+## Responses
+
+|Status|Description|
+|-|-|
+|200|The versions supported by the server|
+
+### 200 response
+
+|Name|Type|Description|
+|-|-|-|
+|unstable_features|string:bool|**Required**: Unstable features that are supported by the server. Features not listed here indicate that a feature isn't supported.|
+|versions|[string]|**Required**: The supported protocol versions
+
+```json
+{
+    "unstable_features": {
+        "example.feature": true
+    },
+    "versions": [
+        "0.0.2",
+        "1",
+    ]
+}
+```