docs: add tutorial for ccapi

samples/application/ccapi/README.md

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+# CCAPI - A web server developed to interface with CC-tools chaincode
+
+## Motivation
+
+As continuation to the [cc-tools-demo]() tutorial on how to integrate the cc-tools project with FPC chaincodes, we start by utilizing another powerful solution offered by cc-tools is the CCAPI. It's a complete web server that simplifies the communication with the peers and Fabric components to replace the need to deal with CLI applications.
+
+## Architecture
+
+The following diagram explains the process where we modified the API server developed for a demo on cc-tools ([CCAPI](https://github.com/hyperledger-labs/cc-tools-demo/tree/main/ccapi)) and modified it to communicate with FPC code.
+
+The transaction client invocation process, as illustrated in the diagram, consists of several key steps that require careful integration between FPC and cc-tools.
+
+1. Step 1-2: The API server is listening for requests on a specified port over an HTTP channel and sends it to the handler.
+2. Step 3: The handler starts by determining the appropriate transaction invocation based on the requested endpoint and calling the corresponding chaincode API.
+3. Step 4: The chaincode API is responsible for parsing and ensuring the payload is correctly parsed into a format that is FPC-friendly. This parsing step is crucial, as it prepares the data to meet FPC’s privacy and security requirements before it reaches the peer.
+4. Step 5: FPCUtils is the step where the actual transaction invocation happens and it follows the steps explained in the previous diagram as it builds on top of the FPC Client SDK.
+
+![CCAPIFlow](./CCAPIFlow.png)
+
+
+## User Experience
+
+CCAPI is using docker and docker-compose for spinning up all the required components needed to work. 
+
+Have a look at the [fpc-docker-compose.yaml](./fpc-docker-compose.yaml) to see how we use different env vars. Most of these environment variables are required by any client application to work and communicate with FPC. If you followed the [cc-tools-demo](../../chaincode/cc-tools-demo/README.md) tutorial, the values should be the same.
+
+Start by running `docker-compose -f fpc-docker-compose.yaml up`