Initial repository structure for Transports WG

Set up the basic structure for the MCP Transports Working Group, modeled
after the financial-services-interest-group repository.

Files added:
- README.md: Mission, meetings, focus areas, participation guide
- CHARTER.md: Scope, proposal promotion pathway
- GOVERNANCE.md: Roles, decision-making process (maintainers TBD)
- CONTRIBUTING.md: How to participate and contribute
- LICENSE: MIT License
- docs/: Directory for future documentation
- proposals/: Directory for transport proposals/specs

Focus areas:
- Scalability (connection pooling, load distribution)
- Reliability (error handling, reconnection, delivery guarantees)
- Transport Semantics (protocol behavior, message ordering)
- Interoperability (cross-platform compatibility, testing)

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Model Context Protocol
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.