Add changelog (#108)

* Add changelog

Co-authored-by: etotmeni <[email protected]>
Co-authored-by: Diptorup Deb <[email protected]>

Author: 3 people

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+## [0.3.5] - 2020-10-06
+### Added
+- Add a helper function to all Python SyclXXX classes to get the address of the base C API pointer as a long.
+
+### Changed
+- Rename PyDPPL to dpCtl in comments (function name renaming to come later)
+
+### Fixed
+- Fix bugs highlighted by tools.
+- Various code clean ups.
+
+## [0.3.4] - 2020-10-05
+### Added
+- Dump functions were enhanced to print back-end information.
+- dpctl gained support for unint_8 and unsigned long data types.
+- oneAPI Beta 10 tool chain support was added.
+
+### Changed
+- dpctl is now aware of DPC++ Sycl PI back-ends. The functionality is now exposed via the context interface.
+- C API's queue manager was refactored to require back-end.
+- dpct's device_context now requires back-end, device-type, and device-id to be provided in a string format, e.g. opencl:gpu:0.
+
+### Fixed
+- Fixed some important bugs found by static analysis.
+
+## [0.3.3] - 2020-10-02
+### Added
+- Add dpctl.get_curent_device_type().
+
+## [0.3.2] - 2020-09-29
+### Changed
+- Set _cpu_device and _gpu_device to None by default.
+
+## [0.3.1] - 2020-09-28
+### Added
+- Add get include and include headers.
+
+### Changed
+- DPPL shared objects are installed into dpctl.
+
+### Fixed
+- Refactor unit tests.
+
+## [0.3.0] - 2020-09-23
+### Added
+- Adds C and Cython API for portions of Sycl queue, device, context interfaces.
+- Implementing USM memory management.
+
+### Changed
+- Refactored API to expose a minimal sycl::queue interface.
+- Modify cpu_queues, gpu_queues and active_queues to functions.
+- Change static vectors to static pointers to verctors. It disables call for destructors. Destructors are also call in undefined order.
+- Rename package PyDPPL to dpCtl.
+- Use dpcpp.exe on Windows instead of dpcpp-cl.exe deleted in oneAPI beta08.
+
+### Fixed
+- Correct use ERRORLEVEL in conda scripts for Windows.
+- Fix using dppl.has_sycl_platforms() and dppl.has_gpu_queues() functions in skipIf