Add draft of decision-making principles

GOVERNANCE.md

@@ -70,6 +70,8 @@ In general, the TSC is responsible for:
 - Deciding how any certification or compatibility programme operates
 - Coordinating any marketing, events, or communications regarding the project.
 
+To aid in decision making, a set of principles guiding what TAMS is and how it develops are set out in [PRINCIPLES.md](./PRINCIPLES.md)
+
 Furthermore during the Setup and Transition Periods, the TSC is charged with:
 
 - Finding a suitable legal and administrative framework through which the project should operate

PRINCIPLES.md

@@ -0,0 +1,40 @@
+# Principles
+
+These principles describe both what TAMS is (and isn’t) as a technology, and also some of the principles that define it’s direction and development.
+The TSC use these to guide technical decision making and shape the direction of the project.
+
+## What is TAMS?
+
+Overall, TAMS and the TAMS API is an interface for writing media to and reading it from a store.
+It provides a framework for sharing that media between systems, solutions and organisations using a content-centric, cloud-native approach, all focused around a store (or a number of stores).
+
+1. TAMS is designed as an interoperable media framework.
+   Having TAMS support should enable integration with other TAMS solutions, removing or minimising the need for bespoke integrations.
+2. TAMS is agnostic to clouds, codecs, and containers and is intended to deploy anywhere, including on-premise and at the edge.
+   It may describe how to integrate with a particular technology, but the core API can be implemented in many ways for many purposes.
+3. TAMS is for media.
+   It is primarily designed for media-like workflows on a timeline, however it also works for data-as-media that is accessed through the index of time (and as such, has data as a supported type).
+4. TAMS supports fast-turnaround/near-live workflows, but also works well for file-based workflows, and in some cases can take the place of live signal-centric workflows, if appropriate latency tradeoffs can be made.
+5. TAMS does not implement a MAM.
+   It should contain the minimum possible content discovery and library management features required for effective interoperability.
+   Anything else should go in a system designed for that purpose.
+6. TAMS is open source to reduce barriers to entry and maximise adoption: anyone should be able to participate in the ecosystem, providing maximum choice.
+7. TAMS is a living specification.
+   It will evolve over time to meet the needs of the community.
+8. The TAMS repository contains the core specification and schemas, along with various examples to help implementers and Application Notes covering best practices and possible approaches to specific areas or technologies.
+
+## Guiding Principles
+
+1. TAMS is a small sharp tool.
+   It does not solve all problems in all ways.
+2. TAMS and the API should be as simple as possible, and always strike a balance across aspects such as complexity, capability, scalability.
+3. TAMS API servers and clients with compatible versions should interoperate.
+   The specification is prescriptive and opinionated where necessary to enable this.
+4. However we aim to give users as much flexibility as possible while ensuring interoperability.
+5. The specification is agnostic to implementation, and we avoid implementation details driving decision-making (however we strike a balance in writing a specification that can be implemented)
+6. Optional features and capabilities are used cautiously, to simplify client implementations and reduce integration engineering work.
+7. We re-use patterns and approaches where possible: both within TAMS, and drawing on existing approaches in other technologies.
+8. Breaking changes are possible, but we strike a balance to minimise impact and maximise benefit.
+   We make decisions with strong engineering justification and consider the impact of change, through an open decision process.
+9. The TAMS community is governed by a balanced mix of users (broadcasters, content owners etc.) and technology/solution vendors.
+10. When common requirements arise, or the need for a common piece of functionality becomes clear, we attempt to standardise an approach either in the API Specification or an Application Note to enable interoperability.

README.md

@@ -32,6 +32,7 @@ Users of TAMS are insulated from the details of the underlying storage.
 - [Rendered Specification](https://bbc.github.io/tams)
 - [Supporting Documentation (Application notes and Decision Records)](./docs/README.md)
 - [Example API Usage Scripts](./examples/README.md)
+- [Description of governance process](./GOVERNANCE.md)
 
 ## Design