Add SAMD20 Xplained Pro eval board

boards/samd20_xplained_pro/.cargo/config.toml

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+[build]
+target = "thumbv6m-none-eabi"
+
+[target.thumbv6m-none-eabi]
+runner = 'arm-none-eabi-gdb -q -x openocd.gdb'
+#runner = 'probe-run --chip ATSAMD21G18A'
+
+rustflags = [
+
+  # This is needed if your flash or ram addresses are not aligned to 0x10000 in memory.x
+  # See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
+  "-C", "link-arg=--nmagic",
+
+  "-C", "link-arg=-Tlink.x",
+]

boards/samd20_xplained_pro/Cargo.toml

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+[package]
+name = "samd20_xplained_pro"
+version = "0.1.0"
+authors = ["Kaizen Sparc <[email protected]>"]
+description = "Board Support crate for the Microchip SAMD20 Xplained Pro eval board"
+keywords = ["no-std", "arm", "cortex-m", "embedded-hal"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/atsamd-rs/atsamd"
+readme = "README.md"
+edition = "2018"
+
+[dependencies.cortex-m-rt]
+version = "0.7"
+optional = true
+
+[dependencies.atsamd-hal]
+path = "../../hal"
+version = "0.14"
+default-features = false
+
+[dev-dependencies]
+cortex-m = "0.7"
+panic-halt = "0.2"
+panic-semihosting = "0.5"
+cortex-m-semihosting = "0.3"
+cortex-m-rtic = "0.5.1"
+
+[features]
+# ask the HAL to enable atsamd20j support
+default = ["rt", "atsamd-hal/samd20j", "atsamd-hal/samd20"]
+rt = ["cortex-m-rt", "atsamd-hal/samd20j-rt"]
+unproven = ["atsamd-hal/unproven"]
+use_semihosting = []
+
+# for cargo flash
+[package.metadata]
+chip = "ATSAMD20J18"
+
+[[example]]
+name = "blinky_basic"

boards/samd20_xplained_pro/README.md

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+# Microchip SAMD20 Xplained Pro
+
+This crate provides a type-safe API for working with the [Microchip SAMD20 Xplained Pro](https://www.microchip.com/en-us/development-tool/ATSAMD20-XPRO).
+
+## Examples?
+
+Check out the repository for examples:
+
+https://github.com/atsamd-rs/atsamd/tree/master/boards/samd20_xplained_pro/examples