add readme for core package

packages/core/README.md

@@ -0,0 +1,27 @@
+## @demex-sdk/core
+
+Core module for most utility functions and object models required for other @demex-sdk packages.
+
+## Quick Start
+
+Install the package with your favourite package manager.
+```shell
+yarn add @demex-sdk/core
+```
+
+### Example: Query address balances
+
+```typescript
+import { Tendermint37Client } from "@cosmjs/tendermint-rpc";
+import { DemexQueryClient } from "@demex-sdk/core";
+
+
+const rpcUrl = "https://tm-api.carbon.network";
+const address = "swth1jv65s3grqf6v6jl3dp4t6c9t9rk99cd8cpw26x";
+
+const tmClient = await Tendermint37Client.connect(rpcUrl);
+const queryClient = DemexQueryClient.instance({ tmClient });
+
+const result = await queryClient.bank.AllBalances({ address, resolveDenom: false });
+result.balances.forEach((bal) => console.log(bal.amount, bal.denom));
+```