Write readme

README.md

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-Template for shared library implemented in c++
+# Weaseljson
+
+An rfc8259-compliant streaming json parser
 
 # Features
 
-- unit tests
-- fuzz targets
-- benchmarks
-- CI
-- (x64,arm64) * (linux,macos) support
-- no libstdc++ dependency
-- python bindings
+- SAX-style api
+- No memory allocations during parsing
+- O(1) stack memory usage
+- Streaming api - no need to buffer the entire document in memory. Parsing is resumed when more data is available
+- Strings are unescaped in place before they're presented. No unicode normalization is performed
+- Robust to crashes with untrusted input
+
+# Rfc8259 conformance notes
+
+- There are no limits on number precision. Numbers are only validated syntactically and are presented as is
+- Only utf-8 is accepted
+- Invalid utf-8 is rejected
+- Byte order markers are rejected
+- Invalid escaped utf16 surrogate pairs are rejected
+- Documents that are too deeply nested are rejected to control memory usage
+- Duplicate keys are presented
+
+# Caveats
+
+- Users should be prepared to discard work done during SAX callbacks if the document is ultimately rejected