Add documentation for /msearch endpoint

docs/Protocol.md

@@ -8,8 +8,9 @@ Accept: application/json
 ```
 
 Parameters:
-- `account_type`: An arbitrary account type string. Currently supported are `all`, `people` and `forum`. Default is `all`.
 - `q`: The search query.
+- `account_type` (optional): An arbitrary account type string. Currently supported are `all`, `people` and `forum`. Default is `all`.
+- `page` (optional): The page number, default is 1.
 
 Returns a JSON structure containing a paginated list profiles matching the search query and the optional account type.
 
@@ -43,6 +44,51 @@ Example:
 }    
 ```
 
+### Legacy interest match search
+
+```
+POST /msearch
+Content-Type: application/x-www-form-urlencoded
+Accept: application/json
+```
+
+Parameters:
+- `s`: The search query, a list of tags separated by spaces or commas is expected.
+- `p` (optional): The page number, default is 1.
+- `n` (optional): The number of items per page, default is 80. 
+
+Returns a JSON structure containing a paginated list profiles matching the search query and the optional account type.
+
+Example:
+
+```json
+{
+      "query": "videogame gaming boardgame politics philosophy development programming php",
+      "page": 1,
+      "itemsperpage": 80,
+      "count": 93,
+      "profiles": [
+            {
+                  "id": "2259",
+                  "name": "Hyp🌧lite Pe☂ov🍃n (he/him)",
+                  "username": "hypolite",
+                  "addr": "hypolite@friendica.mrpetovan.com",
+                  "account_type": "People",
+                  "pdesc": "Subpar geek, french/english, science, games, feminism, jokes and anything in between. Avatar by @DearMsDear@mastodon.art",
+                  "locality": "Brooklyn",
+                  "region": "New York",
+                  "country": "USA",
+                  "profile_url": "https://friendica.mrpetovan.com/profile/hypolite",
+                  "dfrn_request": "https://friendica.mrpetovan.com/dfrn_request/hypolite",
+                  "photo": "https://friendica.mrpetovan.com/photo/27330388315ae4ed2b03e3c116980490-4.jpg?ts=1541567135",
+                  "tags": "videogame gaming boardgame politics philosophy development programming php",
+                  "last_activity": "2018-45"
+            },
+            ...
+      ]
+}    
+```
+
 
 ## Profile submission