Add json-schema for wishlist.toml, and fix wishlist.toml

schemas/wishlist.toml.schema.json

@@ -0,0 +1,34 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema",
+    "$id": "https://github.com/YunoHost/apps/blob/master/schemas/wishlist.toml.schema.json",
+    "title": "Yunohost's wishlist.toml schema",
+    "version": "0",
+
+    "type": "object",
+    "required": [],
+    "additionalProperties": false,
+    "patternProperties": {
+        "^[a-z0-9_-]*$": {
+            "type": "object",
+            "required": ["name", "upstream"],
+            "additionalProperties": false,
+            "properties": {
+                "name": {
+                    "type": "string"
+                },
+                "description": {
+                    "type": "string"
+                },
+                "upstream": {
+                    "type": "string",
+                    "format": "url"
+                },
+                "website": {
+                    "type": "string",
+                    "format": "url"
+                }
+            }
+        }
+    }
+
+}

wishlist.toml

@@ -1014,7 +1014,7 @@ website = "https://rustdesk.com/server"
 
 [sabnzbd]
 name = "SABnzbd"
-descrition = "The automated Usenet download tool"
+description = "The automated Usenet download tool"
 upstream = "https://github.com/sabnzbd/sabnzbd"
 website = "https://sabnzbd.org/"