blake256: Add internal _asm README.md. #2356

	name: Build and Test
	on: [push, pull_request]
	permissions:
	contents: read

	jobs:
	build:
	name: Go CI
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: ["1.21", "1.22"]
	steps:
	- name: Check out source
	uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b #v4.1.4
	- name: Set up Go
	uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 #v5.0.1
	with:
	go-version: ${{ matrix.go }}
	- name: Use lint cache
	uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
	with:
	path: \|
	~/.cache/golangci-lint
	key: go-lint-${{ matrix.go }}-${{ hashFiles('./go.sum') }}
	restore-keys: go-lint-${{ matrix.go }}
	- name: Stablilize testdata timestamps
	run: \|
	bash ./.github/stablilize_testdata_timestamps.sh "${{ github.workspace }}"
	- name: Install Linters
	run: "go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.58.1"
	- name: Build
	run: go build ./...
	- name: Test
	run: \|
	sh ./run_tests.sh

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