Create Solidity how-tos according to the proposed ISC docs structure

[jlvandenhout]

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1. Test a smart contract #1437
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2. Deploy a smart contract #1438
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3. Create a basic contract #1440
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4. Withdraw base tokens #1441
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5. Withdraw native assets #1448
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6. Withdraw NFT #1447
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7. Withdraw Native Token #1442
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8. Generate Randomness #1444
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9. Mint an NFT #1446
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10. Add test code to WASP repo or alternative #1451
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11. Add "register token" how-to #1466
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12. Add "Create foundry" how to #1460
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13. Mint a Custom Token #1445
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14. Get Balance #1439
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