added getInvetory retriever method fixes #30

cadence/contracts/NFTRetrieval.cdc

@@ -150,4 +150,4 @@ pub contract NFTRetrieval {
 
     init() {}
 
-}
+}

cadence/scripts/get_nft_collections_in_account.cdc

@@ -0,0 +1,26 @@
+import MetadataViews from "./MetadataViews.cdc"
+import NFTCatalog from "./NFTCatalog.cdc"
+
+
+pub fun main(ownerAddress: Address) : {String:[UInt64]} {
+
+    let account = getAuthAccount(ownerAddress)
+
+    let inventory : {String:[UInt64]}={}
+    let collections : {String:PublicPath} ={}
+    let types = NFTCatalog.getCatalogTypeData()
+    for nftType in types.keys {
+
+        let typeData=types[nftType]!
+        let collectionKey=typeData.keys[0]
+        let catalogEntry = NFTCatalog.getCatalogEntry(collectionIdentifier:collectionKey)!
+        let tempPathStr = "catalog".concat(collectionKey)
+        let tempPublicPath = PublicPath(identifier: tempPathStr)!
+        account.link<&{MetadataViews.ResolverCollection}>(tempPublicPath, target: catalogEntry.collectionData.storagePath)
+        let cap= account.getCapability<&{MetadataViews.ResolverCollection}>(tempPublicPath)
+        if cap.check(){
+            inventory[nftType] = cap.borrow()!.getIDs()
+        }
+    }
+    return inventory
+}