docs: updated main readme (#79)

Aligned readme to mojaloop standards:
- added ToC
- added auditing dependencies section
- added container scans section
- added automated releases section
- added additional notes section

README.md

@@ -1,9 +1,84 @@
 # Transaction Requests Service
+
 [![Git Commit](https://img.shields.io/github/last-commit/mojaloop/transaction-requests-service.svg?style=flat)](https://github.com/mojaloop/transaction-requests-service/commits/master)
 [![Git Releases](https://img.shields.io/github/release/mojaloop/transaction-requests-service.svg?style=flat)](https://github.com/mojaloop/transaction-requests-service/releases)
 [![Docker pulls](https://img.shields.io/docker/pulls/mojaloop/transaction-requests-service.svg?style=flat)](https://hub.docker.com/r/mojaloop/transaction-requests-service)
 [![CircleCI](https://circleci.com/gh/mojaloop/transaction-requests-service.svg?style=svg)](https://circleci.com/gh/mojaloop/transaction-requests-service)
 
+## Contents
+
+- [Transaction Requests Service](#transaction-requests-service)
+  - [Contents](#contents)
+  - [Interface Specifications](#interface-specifications)
+  - [Auditing Dependencies](#auditing-dependencies)
+  - [Container Scans](#container-scans)
+  - [Automated Releases](#automated-releases)
+    - [Potential problems](#potential-problems)
+  - [Additional Notes](#additional-notes)
 
 ## Interface Specifications
+
 - OpenAPI v3 Interface Specification: [src/interface/openapi.yaml](src/interface/openapi.yaml)
+
+## Auditing Dependencies
+
+We use `npm-audit-resolver` along with `npm audit` to check dependencies for node vulnerabilities, and keep track of resolved dependencies with an `audit-resolve.json` file.
+
+To start a new resolution process, run:
+
+```bash
+npm run audit:resolve
+```
+
+You can then check to see if the CI will pass based on the current dependencies with:
+
+```bash
+npm run audit:check
+```
+
+And commit the changed `audit-resolve.json` to ensure that CircleCI will build correctly.
+
+## Container Scans
+
+As part of our CI/CD process, we use anchore-cli to scan our built docker container for vulnerabilities upon release.
+
+If you find your release builds are failing, refer to the [container scanning](https://github.com/mojaloop/ci-config#container-scanning) in our shared Mojaloop CI config repo. There is a good chance you simply need to update the `mojaloop-policy-generator.js` file and re-run the circleci workflow.
+
+For more information on anchore and anchore-cli, refer to:
+
+- [Anchore CLI](https://github.com/anchore/anchore-cli)
+- [Circle Orb Registry](https://circleci.com/orbs/registry/orb/anchore/anchore-engine)
+
+## Automated Releases
+
+As part of our CI/CD process, we use a combination of CircleCI, standard-version
+npm package and github-release CircleCI orb to automatically trigger our releases
+and image builds. This process essentially mimics a manual tag and release.
+
+On a merge to master, CircleCI is configured to use the mojaloopci github account
+to push the latest generated CHANGELOG and package version number.
+
+Once those changes are pushed, CircleCI will pull the updated master, tag and
+push a release triggering another subsequent build that also publishes a docker image.
+
+### Potential problems
+
+- There is a case where the merge to master workflow will resolve successfully, triggering
+  a release. Then that tagged release workflow subsequently failing due to the image scan,
+  audit check, vulnerability check or other "live" checks.
+
+  This will leave master without an associated published build. Fixes that require
+  a new merge will essentially cause a skip in version number or require a clean up
+  of the master branch to the commit before the CHANGELOG and bump.
+
+  This may be resolved by relying solely on the previous checks of the
+  merge to master workflow to assume that our tagged release is of sound quality.
+  We are still mulling over this solution since catching bugs/vulnerabilities/etc earlier
+  is a boon.
+
+- It is unknown if a race condition might occur with multiple merges with master in
+  quick succession, but this is a suspected edge case.
+
+## Additional Notes
+
+N/A