Add Makefile and Circle CI config

.circleci/config.yml

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+version: 2
+
+jobs:
+  build:
+    docker:
+      - image: circleci/golang:1.12
+    steps:
+      - checkout
+      - run:
+          name: Verify
+          command: make precommit

.gitignore

@@ -0,0 +1 @@
+.tools

Makefile

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+# All documents to be used in spell check.
+ALL_DOCS := $(shell find . -name '*.md' -type f | sort)
+
+TOOLS_DIR := ./.tools
+MISSPELL_BINARY=$(TOOLS_DIR)/misspell
+
+.PHONY: precommit
+precommit: install-misspell misspell
+
+.PHONY: install-misspell
+install-misspell: go.mod go.sum internal/tools.go
+	go build -o $(MISSPELL_BINARY) github.com/client9/misspell/cmd/misspell
+
+.PHONY: misspell
+misspell:
+	$(MISSPELL_BINARY) -error $(ALL_DOCS)
+
+.PHONY: misspell-correction
+misspell-correction:
+	$(MISSPELL_BINARY) -w $(ALL_DOCS)
+

go.mod

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+module github.com/open-telemetry/rfcs
+
+go 1.12
+
+require github.com/client9/misspell v0.3.4

go.sum

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+github.com/client9/misspell v0.3.4 h1:ta993UF76GwbvJcIo3Y68y/M3WxlpEHPWIGDkJYwzJI=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=

internal/tools.go

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+// Copyright 2019, OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// +build tools
+
+package internal
+
+// This file follows the recommendation at
+// https://github.com/golang/go/wiki/Modules#how-can-i-track-tool-dependencies-for-a-module
+// on how to pin tooling dependencies to a go.mod file.
+// This ensures that all systems use the same version of tools in addition to regular dependencies.
+
+import (
+	_ "github.com/client9/misspell/cmd/misspell"
+)