Add optional description to PostMintQuoteBolt11Request (#144)

Co-authored-by: callebtc <[email protected]>

04.md

@@ -23,11 +23,12 @@ The wallet of `Alice` includes the following `PostMintQuoteBolt11Request` data i
 ```json
 {
   "amount": <int>,
-  "unit": <str_enum["sat"]>
+  "unit": <str_enum["sat"]>,
+  "description": <str|null>
 }
 ```
 
-with the requested `amount` and the `unit`.
+with the requested `amount` and the `unit`. An optional `description` can be passed if the mint signals support for it in `MintMethodSetting`.
 
 The mint `Bob` then responds with a `PostMintQuoteBolt11Response`:
 
@@ -206,7 +207,8 @@ The settings for this nut indicate the supported method-unit pairs for minting a
   "method": <str>,
   "unit": <str>,
   "min_amount": <int|null>,
-  "max_amount": <int|null>
+  "max_amount": <int|null>,
+  "description": <bool|null>
 }
 ```
 
@@ -219,7 +221,8 @@ Example `MintMethodSetting`:
   "method": "bolt11",
   "unit": "sat",
   "min_amount": 0,
-  "max_amount": 10000
+  "max_amount": 10000,
+  "description": true
 }
 ```