docs(source-Azure-Blob-Storage): add readme for integration tests (#41086)

Signed-off-by: Artem Inzhyyants <artem.inzhyyants@gmail.com>

airbyte-integrations/connectors/source-azure-blob-storage/integration_tests/README.md

@@ -0,0 +1,32 @@
+# Integration Tests for Azure Blob Storage
+
+
+## Prerequisites
+- `build_customization.py` to install `docker` package in base image
+- `config-*.json` and `configured_catalog.json`
+- `source-faker` configuration inside `./csv_export` folder. `secret_faker.json` has property `count` which represents number of records per file.
+
+## Test Suite
+
+```mermaid
+---
+title: Test Suite for Azure
+---
+flowchart TD
+    A[Test Setup Initialization ] -->
+    B[Generate Random CSV Files using Source-Faker]-->
+    C[Docker Container Setup for Azurite] -->
+    D[Parametrized Tests]
+    subgraph Parametrized Tests: CSV/JSONL/Parquet/Avro
+    D[Convert & upload file]-->
+    E[Run Tests]-->
+    F[Assert # of Records]-->
+    G[Remove uploaded files]
+    end
+
+```
+- `Generate Random CSV Files` calls main.sh in subprocess and wait till 3 csv files will be generated.
+- `Docker Container Setup` runs container with `Azurite server emulator` on localhost.
+- `Convert & upload file` part reads `.csv` and uploads multiple files of desired format (CSV/JSONL/Parquet/Avro) to Azurite.
+- `Tests` assert number of records read from source using provided catalog.
+- After every test finishes, all uploaded files are deleted.