docs: convert changelog release notes from RST to Markdown (#3746)0.21.0

* docs: convert changelog release notes from RST to Markdown

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+# 0.9.0
+
+*March 12, 2021*
+
+## Device Controller Driver (DCD)
+
+### RP2040
+
+- Fix endpoint buffer reallocation overrun problem
+- Fix osal_pico queue overflow in initialization
+- Fix Isochronous endpoint buffer size in transfer
+- Optimize hardware endpoint struct to reduce RAM usage
+- Fix enum workaround forever check for SE0 when pull up is disabled
+
+### Sony CXD56
+
+- Pass the correct speed on Spresense
+- Fix setup processed flag
+
+### NXP Transdimention
+
+- Update dcd_init() to reset controller to device mode
+
+## USB Device Driver (USBD)
+
+- Fix issue with status zlp (`tud_control_status()`) is returned by class driver with SET/CLEAR_FEATURE for endpoint.
+- Correct endpoint size check for fullspeed bulk, can be 8, 16, 32, 64
+- Ack SET_INTERFACE even if it is not implemented by class driver.
+
+## Device Class Driver
+
+### DFU Runtime
+
+- rename `dfu_rt()` to `dfu_runtime()` for easy reading
+
+### CDC
+
+- Add `tud_cdc_send_break_cb()` to support break request
+- Improve CDC receive, minor behavior changes: when `tud_cdc_rx_wanted_cb()` is invoked wanted_char may not be the last byte in the fifo
+
+### HID
+
+- [Breaking] Add itf argument to hid API to support multiple instances, follow API has signature changes
+
+  - `tud_hid_descriptor_report_cb()`
+  - `tud_hid_get_report_cb()`
+  - `tud_hid_set_report_cb()`
+  - `tud_hid_boot_mode_cb()`
+  - `tud_hid_set_idle_cb()`
+
+- Add report complete callback `tud_hid_report_complete_cb()` API
+- Add DPad/Hat support for HID Gamepad
+
+  - `TUD_HID_REPORT_DESC_GAMEPAD()` now support 16 buttons, 2 joysticks, 1 hat/dpad
+  - Add `hid_gamepad_report_t` along with `GAMEPAD_BUTTON_` and `GAMEPAD_HAT_` enum
+  - Add Gamepad to `hid_composite` / `hid_composite_freertos` example
+
+### MIDI
+
+- Fix dropping MIDI sysex message when fifo is full
+- Fix typo in `tud_midi_write24()`, make example less ambiguous for cable and channel
+- Fix incorrect endpoint descriptor length, MIDI v1 use Audio v1 which has 9-byte endpoint descriptor (instead of 7)
+
+## Host Controller Driver (HCD)
+
+- Add rhport to `hcd_init()`
+- Improve EHCI/OHCI driver abstraction
+
+  - Move echi/ohci files to portable/
+  - Rename `hcd_lpc18_43` to `hcd_transdimension`
+  - Sub hcd API with `hcd_ehci_init()`, `hcd_ehci_register_addr()`
+
+- Update NXP transdimension `hcd_init()` to reset controller to host mode
+
+  - Ported hcd to rt10xx
+
+## USB Host Driver (USBH)
+
+- No noticeable changes to usbh
+
+## Host Class Driver
+
+### MSC
+
+- Rename `tuh_msc_scsi_inquiry()` to `tuh_msc_inquiry()`
+- Rename `tuh_msc_mounted_cb()`/`tuh_msc_unmounted_cb()` to `tuh_msc_mount_cb()`/`tuh_msc_unmount_cb()` to match device stack naming
+- Change `tuh_msc_is_busy()` to `tuh_msc_ready()`
+- Add read10 and write10 function: `tuh_msc_read10()`, `tuh_msc_write10()`
+- Read_Capacity is invoked as part of enumeration process
+- Add `tuh_msc_get_block_count()`, `tuh_msc_get_block_size()`
+- Add `CFG_TUH_MSC_MAXLUN` (default to 4) to hold lun capacities
+
+## Others
+
+- Add basic support for rt-thread OS
+- Change zero bitfield length to more explicit padding
+- Build example now fetch required submodules on the fly while running `make` without prior submodule init for mcu drivers
+- Update pico-sdk to v1.1.0
+
+### New Boards
+
+- Microchip SAM E54 Xplained Pro
+- LPCXpresso 55s28
+- LPCXpresso 18s37
+
+## Contributors
+
+Thanks to everyone who contributed to this release: @amitv87, @duddie, @hathach, @HiFiPhile, @homeodor, @ipopov, @jgressmann, @kamtom480, @liamfraser, @lurch, @majbthrd, @ndinsmore, @tfx2001, @xmos-jmccarthy.