Document and recommend base64 format for providing content via the API

app/jvm/src/main/resources/routes

@@ -23,12 +23,14 @@ GET  /externalapi/healthcheck/         hydro.controllers.StandardActions.healthC
 GET  /externalapi/dbschema/:appSecret/  hydro.controllers.StandardActions.databaseSchema(appSecret)
 GET  /externalapi/clearoldentitymodifications/:dryOrWet/:appSecret/  hydro.controllers.StandardActions.clearOldEntityModifications(dryOrWet, appSecret)
 GET  /externalapi/share/:docId/:loginName/:appSecret/  app.controllers.ExternalApi.shareDocument(docId, loginName, appSecret)
+# Inserts a task. It is recommended to provide `content` in the form of "base64:<base64 encoded Markdown content>"
 GET  /externalapi/inserttask/:docId/$parentTag<[^/]+>/:appSecret/*content  app.controllers.ExternalApi.insertTask(docId, parentTag, content, appSecret)
 GET  /externalapi/gettasksasjson/:docId/$parentTag<[^/]+>/:appSecret/ app.controllers.ExternalApi.getTasksAsJson(docId, parentTag, appSecret)
 GET  /externalapi/regenordertokens/:dryOrWet/:appSecret/  app.controllers.ExternalApi.regenerateOrderTokens(dryOrWet, appSecret)
 
 # Interactive shortcuts
 GET  /interactive/done  app.controllers.ExternalApi.interactiveDone()
+# Inserts a task. It is recommended to provide `content` in the form of "base64:<base64 encoded Markdown content>"
 GET  /interactive/inserttask/:docId/$parentTag<[^/]+>/*content  app.controllers.ExternalApi.interactiveInsertTask(docId, parentTag, content)
 
 # Auth