Added create and transfer resolver (#821)

## Describe your changes
Added create and transfer resolver.

primitives/polkadex/src/assets.rs

@@ -18,9 +18,12 @@
 
 use crate::Balance;
 use codec::{Decode, Encode, MaxEncodedLen};
-use frame_support::traits::{
-	tokens::{Fortitude, Precision, Preservation},
-	Get,
+use frame_support::{
+	ensure,
+	traits::{
+		tokens::{Fortitude, Precision, Preservation},
+		Get,
+	},
 };
 use scale_info::TypeInfo;
 #[cfg(feature = "std")]
@@ -97,6 +100,39 @@ pub trait Resolver<
 		}
 		Ok(())
 	}
+
+	/// Create New Asset
+	fn resolve_create(
+		asset: AssetId,
+		admin: AccountId,
+		min_balance: Balance,
+	) -> Result<(), DispatchError> {
+		ensure!(asset != NativeAssetId::get(), DispatchError::Other("Cannot create Native Asset"));
+		ensure!(!Others::asset_exists(asset.into()), DispatchError::Other("Asset already exists"));
+		Others::create(asset.into(), admin, true, min_balance.saturated_into())?;
+		Ok(())
+	}
+
+	///Transfer Asset
+	fn resolve_transfer(
+		asset: AssetId,
+		from: &AccountId,
+		to: &AccountId,
+		amount: Balance,
+	) -> Result<(), DispatchError> {
+		if asset == NativeAssetId::get() {
+			Native::transfer(from, to, amount.saturated_into(), Preservation::Preserve)?;
+		} else {
+			Others::transfer(
+				asset.into(),
+				from,
+				to,
+				amount.saturated_into(),
+				Preservation::Preserve,
+			)?;
+		}
+		Ok(())
+	}
 }
 
 /// Enumerated asset on chain