Create HighLevelGoals.md

This high-level design goal list has been passed around and generally agreed upon, so I'll put it up.  Of course we can continue to discuss and iterate in issues.

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+# WebAssembly High-Level Design Goals
+
+1. Define a portable, size- and load-time-efficient binary format to serve as a web compilation target.
+2. Define a human-editable text format that is isomorphic and convertible to/from the binary format.
+3. Design v.1 to allow an effective (load-time and performance) [polyfill](https://github.com/WebAssembly/polyfill) via client-side compilation to [asm.js](http://asmjs.org).
+4. Design v.1 as a Minimum Viable Product: basically what you can do with [asm.js](http://asmjs.org).
+5. Design to integrate well with the existing web platform:
+    * execute in the same semantic universe as JavaScript;
+    * allow synchronous calls to and from JavaScript;
+    * enforce the same-origin security policy; and 
+    * access browser functionality through the same Web APIs that are accessible to JavaScript.
+6. Design to maintain the versionless, feature-testing and backwards-compatible evolution story 
+   of the web; engines should not need multiple, versioned decoders.
+7. Design to allow execution in non-browser environments.
+
+