Add spl-token documentation

docs/targets/solana.rst

@@ -72,3 +72,17 @@ The contract can be used via the `@solana/solidity <https://www.npmjs.com/packag
 package has `documentation <https://solana-labs.github.io/solana-solidity.js/>`_ and there
 are `some examples <https://solana-labs.github.io/solana-solidity.js/>`_. There is also
 `solang's integration tests <https://github.com/hyperledger-labs/solang/tree/main/integration/solana>`_.
+
+Using spl-token
+---------------
+
+`spl-token <https://spl.solana.com/token>`_ is the solana native way of creating tokens, minting, burning, transfering
+and swapping tokens. We have created example of how to use spl-token from Solidity. This files should be imported, and
+then added as a base contract to your contract.
+
+.. include:: ../../examples/spl_token.sol
+  :code: solidity
+
+There is an example in our integration tests of how this should be used, specified
+`token.sol <https://github.com/hyperledger-labs/solang/blob/main/integration/solana/token.sol>`_ and
+`token.spec.ts <https://github.com/hyperledger-labs/solang/blob/main/integration/solana/token.spec.ts>`_.