New pbs adapter: Showheroes (prebid#6256)

* add support for prebid server

* md style fix

Author: FilipStamenkovic

dev-docs/bidders/showheroes-bs.md

@@ -14,6 +14,7 @@ floors_supported: true
 fpd_supported: true
 multiformat_supported: will-bid-on-one
 sidebarType: 1
+pbs: true
 ---
 
 
@@ -55,6 +56,27 @@ Or, more easily you can mark the whole request as a test request by doing:
 pbjs.setConfig({ortb2: {test: 1}})
 ```
 
+#### Prebid Server Test Request
+
+To verify that the Prebid Server is working properly with the server-side `Showheroes` adapter a `test` property can be utilized.
+
+```json
+{
+  "imp": [{
+    "video": {},
+    "ext": {
+      "params": {
+          "unitId": "1234abcd-5678efgh"
+      }
+    }
+  }],
+  "site": {
+    "page": "{PAGE_URL}"
+  },
+  "test": 1
+}
+```
+
 #### Outstream
 
 Example of adunit configuration for the outstream unit: