Add Readme, and copy charter from WebAssembly/meetings#271

Charter.md

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+# WebAssembly Debugging Subgroup Charter
+
+The Debugging Subgroup is a sub-organization of the
+[WebAssembly Community Group](https://www.w3.org/community/webassembly/) of the W3C.
+As such, it is intended that its charter align with that of the CG. In particular, 
+the sections of the [CG charter](https://webassembly.github.io/cg-charter/) relating to
+[Community and Business Group Process](https://webassembly.github.io/cg-charter/#process),
+[Contribution Mechanics](https://webassembly.github.io/cg-charter/#contrib),
+[Transparency](https://webassembly.github.io/cg-charter/#transparency), and
+[Decision Process](https://webassembly.github.io/cg-charter/#decision) also apply to the Subgroup.
+
+## Goals
+
+The mission of this sugbroup is to provide a forum for pre-standardization
+collaboration on debugging capabilities for WebAssembly programs.
+
+## Scope
+
+The Subgroup will consider topics related to debugging, profiling, or
+static analysis of WebAssembly programs, including:
+
+- File formats and encodings for WebAssembly debug information
+e.g. as custom sections in wasm executables or object files, 
+- Extensions to the WebAssembly text format for debug information
+- Interaction with browsers or other embedders (e.g. developer tools, debugging, profiling)
+- Interaction with external debuggers and IDEs (VS Code), and
+debuggers running as wasm-hosted code.
+- Presentation of source, callstack, or debugging information in embedders, debuggers,
+or IDEs
+
+
+## Deliverables
+
+### Specifications
+The Subgroup may produce several kinds of specification-related work output:
+- Extensions or amendments to existing specifications (e.g. Wasm core or
+web spec, DWARF, EcmaScript)
+- Creation of new specifications in standards bodies or working
+groups (e.g. Wasm WG, TC39, or future general web-debugging standards working group)
+- Creation of new specifications outside of standards bodies
+(e.g. similar to the LLVM object file format documentation in Wasm tool conventions)
+
+### Non-normative reports
+The Subgroup may produce non-normative material such as requirements
+documents, recommendations, and use cases.
+
+### Software
+The Subgroup may produce software related to Wasm debugging (either as
+standalone tooling or integration of debugging related functionality
+in existing CG software such as Binaryen or WABT). Capabilities may include:
+- Debug info encoding or translation
+- Program instrumentation or analysis
+- Interactive debuggers or profilers
+- Test suites
+
+## Amendments to this Charter and Chair Selection
+
+This charter may be amended, and Subgroup Chairs may be selected by vote of the full
+WebAssembly Community Group.

Readme.md

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+# WebAssembly Debugging Subgroup
+
+This repository is for the Debugging Subgroup of the 
+[WebAssembly Community Group](https://www.w3.org/community/webassembly/). Its
+[Charter](Charter.md) describes the goals, scope and deliverables of the group.
+The repository may contain meeting notes, reports, documentation, specifications and/or software
+produced by the group (although larger projects may also have their own repositories).