Add docs

Signed-off-by: Martynas Gurskas <[email protected]>

CHANGELOG.md

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+----
+
+### v0.1.0+v0.23.0
+
+- Initial release.
+
+----

CONTRIBUTING.md

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+# How to submit changes
+
+Pull requests are welcome!
+
+# How to report issues/bugs?
+
+Create an issue on Github, we will try to get back to you ASAP.
+
+# Checkout the code
+
+```
+git clone https://github.com/NordSecurity/uniffi-bindgen-cpp.git
+```
+
+# Run tests
+
+To run tests, a `cmake` installation is required. Unlike `uniffi-rs`, there is no integration with
+`cargo test`.
+
+- Build `uniffi-bindgen-cpp` executable, `libuniffi_fixtures.so` shared library and produce the bindings.
+
+    ```
+    cd cpp-tests
+    mkdir build
+    cd build
+    cmake ..
+    make
+    ```
+
+- Run tests
+
+    ```
+    make test
+    ```
+
+# Thank you