Add basic docs for clickhouse v2 (#62027)

docs/integrations/destinations/clickhouse-v2.md

@@ -1,5 +1,78 @@
 # ClickHouse v2
 
+A fresh implementation of ClickHouse leveraging our new CDK. 
+
+## Improvements over v1
+* All sync modes supported
+* Data will be typed and written to columns matching the defined schema (Direct Load)
+* Performance improvements
+* Actively maintained and developed by Airbyte
+
+## Features
+
+All sync modes are supported.
+
+| Feature                        | Supported?\(Yes/No\) | Notes                          |
+| :----------------------------- |:---------------------|:-------------------------------|
+| Full Refresh Sync              | Yes                  |                                |
+| Incremental - Append Sync      | Yes                  |                                |
+| Incremental - Append + Deduped | Yes                  | Leverages `ReplacingMergeTree` |
+| Namespaces                     | Yes                  |                                |
+
+### Output Schema
+
+Each stream will be output into its own table in ClickHouse in either the configured default database (`default`) or a database corresponding to the specified namespace on the stream.
+
+Airbyte types will be converted as follows:
+
+    BooleanType -> Bool
+    DateType -> Date32
+    IntegerType -> Int64
+    NumberType (float) -> DECIMAL128(9)
+    StringType -> String
+    TimeTypeWithTimezone -> String
+    TimeTypeWithoutTimezone -> String
+    TimestampTypeWithTimezone -> DateTime64(3)
+    TimestampTypeWithoutTimezone -> DateTime64(3)
+    Other Misc. -> String
+
+### Requirements
+
+To use the ClickHouse destination, you'll need:
+
+- A cloud ClickHouse instance
+- A ClickHouse server version 21.8.10.19 or above
+
+### Configure Network Access
+
+Make sure your ClickHouse database can be accessed by Airbyte. If your database is within a VPC, you may need to allow access from the IP you're using to expose Airbyte.
+
+### **Permissions**
+
+You need a ClickHouse user with the following permissions:
+
+- can create tables and write rows.
+- can create databases e.g:
+
+You can create such a user by running:
+
+```
+GRANT CREATE ON * TO airbyte_user;
+GRANT CREATE ON {your configured default database} * TO airbyte_user;
+GRANT DROP ON * TO airbyte_user;
+GRANT TRUNCATE ON * TO airbyte_user;
+GRANT INSERT ON * TO airbyte_user;
+GRANT SELECT ON * TO airbyte_user;
+GRANT CREATE DATABASE ON airbyte_internal.* TO airbyte_user;
+GRANT CREATE TABLE ON airbyte_internal.* TO airbyte_user;
+GRANT DROP ON airbyte_internal.* TO airbyte_user;
+GRANT TRUNCATE ON airbyte_internal.* TO airbyte_user;
+GRANT INSERT ON airbyte_internal.* TO airbyte_user;
+GRANT SELECT ON airbyte_internal.* TO airbyte_user;
+```
+
+You can also use a pre-existing user but we highly recommend creating a dedicated user for Airbyte.
+
 ## Changelog
 
 <details>