docs: update readme with stamp create instructions

[NoahMaizels]

docs: add stamp create section to README

[github-actions]

File	Coverage Now	Coverage Before	Delta%	Rating
Total	1963 / 2685	1963 / 2685	0.00
application.ts	0 / 2	0 / 2	0.00
config.ts	31 / 32	31 / 32	0.00
curl.ts	24 / 24	24 / 24	0.00
index.ts	0 / 16	0 / 16	0.00
printer.ts	3 / 7	3 / 7	0.00
command/addresses.ts	32 / 37	32 / 37	0.00
command/download.ts	28 / 35	28 / 35	0.00
command/hash.ts	8 / 10	8 / 10	0.00
command/quickstart.ts	10 / 37	10 / 37	0.00
command/status.ts	57 / 79	57 / 79	0.00
command/upload.ts	147 / 212	147 / 212	0.00
command/cheque/cashout.ts	30 / 32	30 / 32	0.00
command/cheque/cheque-command.ts	21 / 25	21 / 25	0.00
command/cheque/deposit.ts	8 / 12	8 / 12	0.00
command/cheque/index.ts	9 / 9	9 / 9	0.00
command/cheque/list.ts	13 / 13	13 / 13	0.00
command/cheque/withdraw-all.ts	6 / 15	6 / 15	0.00
command/cheque/withdraw.ts	8 / 12	8 / 12	0.00
command/feed/feed-command.ts	47 / 47	47 / 47	0.00
command/feed/index.ts	7 / 7	7 / 7	0.00
command/feed/print.ts	26 / 80	26 / 80	0.00
command/feed/update.ts	14 / 15	14 / 15	0.00
command/feed/upload.ts	22 / 24	22 / 24	0.00
command/grantee/create.ts	20 / 20	20 / 20	0.00
command/grantee/get.ts	11 / 11	11 / 11	0.00
command/grantee/grantee-command.ts	2 / 2	2 / 2	0.00
command/grantee/index.ts	7 / 7	7 / 7	0.00
command/grantee/patch.ts	21 / 21	21 / 21	0.00
command/identity/create.ts	36 / 41	36 / 41	0.00
command/identity/export.ts	20 / 22	20 / 22	0.00
command/identity/identity-command.ts	21 / 27	21 / 27	0.00
command/identity/import.ts	50 / 63	50 / 63	0.00
command/identity/index.ts	11 / 11	11 / 11	0.00
command/identity/list.ts	21 / 21	21 / 21	0.00
command/identity/remove.ts	15 / 21	15 / 21	0.00
command/identity/rename.ts	16 / 16	16 / 16	0.00
command/identity/show.ts	27 / 33	27 / 33	0.00
command/manifest/add.ts	38 / 39	38 / 39	0.00
command/manifest/create.ts	16 / 17	16 / 17	0.00
command/manifest/download.ts	49 / 50	49 / 50	0.00
command/manifest/index.ts	11 / 11	11 / 11	0.00
command/manifest/list.ts	40 / 42	40 / 42	0.00
command/manifest/merge.ts	24 / 25	24 / 25	0.00
command/manifest/remove.ts	26 / 29	26 / 29	0.00
command/manifest/sync.ts	46 / 50	46 / 50	0.00
command/pinning/index.ts	9 / 9	9 / 9	0.00
command/pinning/list.ts	14 / 14	14 / 14	0.00
command/pinning/pin.ts	10 / 11	10 / 11	0.00
command/pinning/pinning-command.ts	5 / 8	5 / 8	0.00
command/pinning/reupload-all.ts	21 / 23	21 / 23	0.00
command/pinning/reupload.ts	9 / 17	9 / 17	0.00
command/pinning/unpin.ts	11 / 11	11 / 11	0.00
command/pss/index.ts	7 / 7	7 / 7	0.00
command/pss/pss-command.ts	8 / 8	8 / 8	0.00
command/pss/receive.ts	18 / 24	18 / 24	0.00
command/pss/send.ts	29 / 34	29 / 34	0.00
command/pss/subscribe.ts	8 / 18	8 / 18	0.00
command/root-command/command-config.ts	30 / 36	30 / 36	0.00
command/root-command/command-log.ts	60 / 78	60 / 78	0.00
command/root-command/index.ts	40 / 44	40 / 44	0.00
command/root-command/printer.ts	9 / 9	9 / 9	0.00
command/stake/deposit.ts	31 / 40	31 / 40	0.00
command/stake/index.ts	8 / 8	8 / 8	0.00
command/stake/recover.ts	10 / 22	10 / 22	0.00
command/stake/status.ts	11 / 11	11 / 11	0.00
command/stake/withdraw.ts	7 / 25	7 / 25	0.00
command/stamp/buy.ts	51 / 65	51 / 65	0.00
command/stamp/create.ts	18 / 72	18 / 72	0.00
command/stamp/dilute.ts	12 / 27	12 / 27	0.00
command/stamp/extend.ts	10 / 51	10 / 51	0.00
command/stamp/index.ts	11 / 11	11 / 11	0.00
command/stamp/list.ts	28 / 31	28 / 31	0.00
command/stamp/show.ts	13 / 14	13 / 14	0.00
command/stamp/stamp-command.ts	3 / 7	3 / 7	0.00
command/stamp/topup.ts	11 / 23	11 / 23	0.00
command/utility/cid.ts	8 / 13	8 / 13	0.00
command/utility/create-batch.ts	14 / 34	14 / 34	0.00
command/utility/index.ts	14 / 22	14 / 22	0.00
command/utility/lock.ts	7 / 11	7 / 11	0.00
command/utility/rchash.ts	7 / 23	7 / 23	0.00
command/utility/redeem.ts	12 / 51	12 / 51	0.00
command/utility/unlock.ts	7 / 12	7 / 12	0.00
command/wallet/index.ts	7 / 7	7 / 7	0.00
command/wallet/status.ts	11 / 11	11 / 11	0.00
command/wallet/withdraw-bzz.ts	19 / 21	19 / 21	0.00
command/wallet/withdraw-dai.ts	19 / 21	19 / 21	0.00
service/identity/index.ts	32 / 36	32 / 36	0.00
service/identity/types/identity.ts	4 / 4	4 / 4	0.00
service/identity/types/index.ts	1 / 1	1 / 1	0.00
service/stamp/index.ts	30 / 32	30 / 32	0.00
utils/bzz-address.ts	24 / 30	24 / 30	0.00
utils/chainsync.ts	4 / 4	4 / 4	0.00
utils/contracts.ts	3 / 3	3 / 3	0.00
utils/error.ts	39 / 44	39 / 44	0.00
utils/hex.ts	10 / 14	10 / 14	0.00
utils/index.ts	51 / 83	51 / 83	0.00
utils/message.ts	3 / 12	3 / 12	0.00
utils/mime.ts	5 / 5	5 / 5	0.00
utils/option.ts	3 / 3	3 / 3	0.00
utils/rpc.ts	9 / 37	9 / 37	0.00
utils/spinner.ts	15 / 15	15 / 15	0.00
utils/text.ts	14 / 17	14 / 17	0.00