update readme (#303)

* refactor

* refactor

* refactor: add rust docs

* Update README.md

Co-authored-by: Jeremy Felder <jeremy.felder1@gmail.com>

* Update README.md

Co-authored-by: Jeremy Felder <jeremy.felder1@gmail.com>

* refactor

* Update icicle/README.md

Co-authored-by: Jeremy Felder <jeremy.felder1@gmail.com>

* Update wrappers/rust/README.md

Co-authored-by: Jeremy Felder <jeremy.felder1@gmail.com>

* Update README.md

Co-authored-by: Jeremy Felder <jeremy.felder1@gmail.com>

* refactor

* remove

---------

Co-authored-by: Jeremy Felder <jeremy.felder1@gmail.com>

wrappers/rust/README.md

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+### Rust Bindings
+
+`icicle-core` defines all interfaces, macros and common methods.
+
+`icicle-cuda-runtime` defines `DeviceContext` which can be used to manage a specific GPU as well as wrapping common CUDA methods.
+
+`icicle-curves` implements all interfaces and macros from `icicle-core` for each curve. For example `icicle-bn254` implements curve `bn254`. Each curve has its own [build script](./icicle-curves/icicle-bn254/build.rs) which will build the CUDA libraries for that curve as part of the rust-toolchain build.
+
+## Building a curve and running tests
+
+Enter a curve implementation.
+
+```
+cd icicle-curves/icicle-bn254
+```
+
+To build 
+
+```sh
+cargo build --release
+```
+
+The build may take a while because we are also building the CUDA libraries for the selected curve.
+
+To run benchmarks
+
+```
+cargo bench
+```
+
+To run test
+
+```sh
+cargo test -- --test-threads=1
+```
+
+The flag `--test-threads=1` is needed because currently some tests might interfere with one another inside the GPU.