Merge pull request #143 from oracle-devrel/Ulrike

Create README.md for blockchain table technology

Author: JesusGitHubOracle

data-platform/core-converged-db/db-blockchain/README.md

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+# Blockchain Tables
+
+Blockchain tables are insert-only tables that organize rows into a number of system chains. Blockchain and Immutable tables are part of the Crypto-Secure Data Management features in Oracle 19c and later releases. Rows in a blockchain table are made tamper-resistant by special sequencing and chaining algorithms. 
+Users can verify that rows have not been tampered. A hash value that is part of the row metadata is used to chain and validate rows.
+ 
+
+## Useful Links
+
+### Documentation
+
+- [Database Administrator's Guide 21c](https://docs.oracle.com/en/database/oracle/oracle-database/21/admin/managing-tables.html#GUID-707B02F5-E589-4C20-8E2E-5ED4F7888702)
+- [Database Administrator's Guide 23c](https://docs.oracle.com/en/database/oracle/oracle-database/23/admin/managing-tables.html#GUID-707B02F5-E589-4C20-8E2E-5ED4F7888702)
+- [DBMS_BLOCKCHAIN_TABLE in 21c](https://docs.oracle.com/en/database/oracle/oracle-database/21/arpls/dbms_blockchain_table.html#GUID-8B000001-AE8B-42EA-8BF3-E590BCBA6657)
+- [DBMS_BLOCKCHAIN_TABLE in 23c](https://docs.oracle.com/en/database/oracle/oracle-database/23/arpls/dbms_blockchain_table.html#GUID-8B000001-AE8B-42EA-8BF3-E590BCBA6657)
+- [Differences Between Immutable Tables and Blockchain Tables](https://docs.oracle.com/en/database/oracle/oracle-database/21/admin/managing-tables.html#GUID-55B51BC2-6367-4728-87C2-C30E898DD6FD)
+
+
+### Blogs
+
+- [Blockchain Tables in Oracle Database: Technology Convergence](https://blogs.oracle.com/blockchain/post/blockchain-tables-in-oracle-database-technology-convergence)
+- [Native Blockchain Tables Extend Oracle Database’s Multi-model Converged Architecture](https://blogs.oracle.com/blockchain/post/native-blockchain-tables-extend-oracle-databases-multi-model-converged-architecture)
+
+### Team Publications
+
+- [Oracle Database native Blockchain and Immutable Tables](https://blogs.oracle.com/coretec/post/blockchain-or-immutable-tables)
+
+
+### LiveLabs Workshops
+
+- [Database 21c - Blockchain](https://apexapps.oracle.com/pls/apex/r/dbpm/livelabs/view-workshop?wid=746&clear=RR,180&session=11311967125302)
+- [Prevent and Detect Fraud Using Blockchain Tables on Oracle Autonomous Database](https://apexapps.oracle.com/pls/apex/r/dbpm/livelabs/view-workshop?wid=875&clear=RR,180&session=11311967125302)
+
+
+## Videos
+
+- [What's new with in-database blockchain and crypto-security? | CloudWorld 2022](https://www.youtube.com/watch?v=6rcjornuDXU)
+- [Blockchain Tables in Oracle Database - On-demand webinar](https://go.oracle.com/LP=111864?elqCampaignId=296036)
+
+
+# License
+
+Copyright (c) 2023 Oracle and/or its affiliates.
+
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See LICENSE for more details.