Add sample python code for DIDs and Price Oracles (#2932)

* Create create_price_oracle.py

* Create README.md

* Update README.md

* Update create_price_oracle.py

* Create delete_price_oracle.py

* Update delete_price_oracle.py

* Create account_price_oracles.py

* Create did_set.py

* Create did_delete.py

* Create account_did.py

* Create requirements.txt

* Create README.md

* Create requirements.txt

* Update README.md

* Update README.md

* Create README.md

* Create README.md

* Update did_set.py

* Update did_set.py

* Update did_set.py

* Update did_delete.py

* Update README.md

* Update create_price_oracle.py

* Update did_set.py

* Update README.md

* Update README.md

* Update delete_price_oracle.py

* Update README.md

_code-samples/did/py/did_delete.py

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+# neccasary imports
+from xrpl.models import DIDDelete
+from xrpl.clients import JsonRpcClient
+from xrpl.wallet import Wallet
+from xrpl.transaction import submit_and_wait
+
+
+# connect to the xrpl via a client
+print("Connecting to client")
+client = JsonRpcClient("https://s.altnet.rippletest.net:51234")
+print("connected!!!")
+
+
+# input the seed that was generated from running the did_set.py
+seed = input("now, enter the seed of the account that has a DID object to delete: ")
+
+# restore an account that has an existing DID
+account_did_creator = Wallet.from_seed(seed=seed)
+
+# define the account DIDDelete transaction
+did_delete_txn = DIDDelete(account=account_did_creator.address)
+
+# sign, submit the did delete transaction and wait for result
+print("signed and submitting did delete transaction. awaiting response...")
+did_delete_response = submit_and_wait(
+    transaction=did_delete_txn,
+    wallet=account_did_creator,
+    client=client,
+)
+
+# Parse response for result
+did_delete_result = did_delete_response.result
+
+# Print result and transaction hash
+print(did_delete_result["meta"]["TransactionResult"])
+print(did_delete_result["hash"])