Updating README and adding CHANGELOG

Author: mgibson-antithesis

CHANGELOG.md

@@ -0,0 +1,53 @@
+# Changelog
+
+## 0.4.7 - 2026-02-13
+
+Simplify numeric guidance internals. This fixes a bug where certain numeric comparisons could produce incorrect guidance results.
+
+## 0.4.6 - 2026-02-09
+
+Reduce verbosity of guidance tracking.
+
+## 0.4.5 - 2025-01-03
+
+Fix `ALWAYS_SOME` and `SOMETIMES_ALL` macro implementations.
+
+## 0.4.4 - 2024-12-13
+
+Add polyfill macros for `NO_ANTITHESIS_SDK` mode, which let you override the behavior of assertion macros when the SDK is compiled out, instead of them silently doing nothing.
+
+Change `check_assertion` to handle boolean conversions better.
+
+## 0.4.3 - 2024-11-12
+
+JSON string escaping fix for ASCII control characters 0x00-0x1F.
+
+Fixing compilation issues with SOMETIMES_ALL and ALWAYS_SOME.
+
+The `details` argument is not optional in all assertion macros.
+
+## 0.4.2 - 2024-10-10
+
+Improvements to JSON handling
+
+## 0.4.0 - 2024-07-01
+
+Adding guidance-based assertions. These are both assertions and guidance for the fuzzer to explore your program more effectively.
+
+## 0.3.1 - 2024-06-06
+
+Dedup catalog entries.
+
+## 0.3.0 - 2024-05-10
+
+Instrumentation is now in a separate file: antithesis_instrumentation.h. 
+Instrumentation supports both C++ and C. (The remainder of the SDK is C++-only.)
+
+## 0.2.3 - 2024-04-25
+Adding `inline` to __sanitizer_cov_trace_pc_guard_init and __sanitizer_cov_trace_pc_guard.
+
+## 0.2.2 - 2024-03-29
+
+Supporting coverage instrumentation via __sanitizer_cov_trace_pc_guard_init and __sanitizer_cov_trace_pc_guard.
+
+Change to dlopen-based loading of libvoidstar.so

README.md

@@ -5,4 +5,4 @@ This library provides methods for C++ programs to configure the [Antithesis](htt
 * Randomness functions for requesting both structured and unstructured randomness from the Antithesis platform.
 * Lifecycle functions that inform the Antithesis environment that particular test phases or milestones have been reached.
 
-For general usage guidance see the [Antithesis C++ SDK Documentation](https://antithesis.com/docs/using_antithesis/sdk/cpp/overview/)
+For general usage guidance see the [Antithesis C++ SDK Documentation](https://antithesis.com/docs/using_antithesis/sdk/cpp/)