Add MesaPy's README

README.md

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+# MesaPy: A Memory-safe Python Implementation based on PyPy 
+
+MesaPy is a memory-safe Python implementation based on PyPy. In addition to
+PyPy's distinct features -- speed, memory usage, compatibility and stackless,
+MesaPy mainly focuses on improving its security and memory safety. On top of
+the enhancements, we also bring MesaPy into Intel SGX to write memory-safe
+applications running in the trusted execution environment.
+
+We achieve the memory-safety promise through various methods: hardening
+RPython's type system (RPython is the language for writing PyPy), modifying
+PyPy/RPython's libraries, and verifying the RPython's libraries as well as its
+interpreter/JIT backend. Overall, there are four most notable security
+features of MesaPy:
+
+- **Memory safety**: To provide a memory-safe runtime, MesaPy replaces external
+  libraries written in C, which could introduce memory issues, with Rust, a
+  memory-safe programming language. This guarantees the memory safety across
+  all libraries including those written in Python, but also external libraries.
+
+- **Security hardening**: PyPy is implemented with RPython, a statically-typed
+  language with translation and support framework. We also enhanced
+  memory-safety of RPython through hardening RPython's type system, i.e., the
+  RPython Typer. For example, we improve RPython's list with runtime index check
+  to avoid arbitrarily list read/write during PyPy's implementation.
+
+- **Formal verification**: Some code in RPython's libraries and its
+  interpreter/JIT backend are still written in C, which may contain potential
+  memory bugs. To prove the memory safety of RPython, we aim to formally
+  verified its libraries and backend written in C using state-of-the-art
+  verification tools.
+
+- **SGX support**: With the memory safety of MesaPy, we also port it to
+  Intel SGX, which is a trusted execution environment to provide integrity and
+  confidentiality guarantees to security-sensitive computation. Developers now
+  can easily use MesaPy to implement SGX applications without worrying about
+  memory issues.
+
+# Maintainers
+
+  - **Memory-safety and security hardening**: Mingshen Sun `<mssun@mesalock-linux.org>`
+  - **Formal verification**: Qian Feng
+  - **SGX support**: Huibo Wang and Yu Ding
+
+# Steering Committee
+
+  - Tao Wei
+  - Yulong Zhang
+
+# License
+
+MesaPy is provided under the 3-Clause BSD license. For a copy, see the LICENSE file.