Makefile and readme

Makefile

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+.PHONY: build install server
+
+PROJECT_NAME=$(shell basename $(CURDIR))
+
+## build: build the application
+build:
+	export GO111MODULE="on"; \
+	go mod download; \
+	go mod vendor; \
+	CGO_ENABLED=0 go build -a -ldflags '-s' -installsuffix cgo -o main cmd/server/main.go
+
+## install: fetches go modules
+install:
+	export GO111MODULE="on"; \
+	go mod tidy; \
+	go mod download \
+
+## server: runs the server with -race
+server:
+	export GO111MODULE="on"; \
+	go run -race cmd/server/main.go
+
+## modd: Monitors the directory, and recompiles your app every time a file changes. Also runs tests.
+## (To install modd, run: go get github.com/cortesi/modd/cmd/modd)
+modd:
+	modd

README.md

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+# Planetposen email sender
+
+App for sending emails related to planetposen webshop. Currently only supports sending order confirmations emails after purchase.
+
+## Setup
+From source:
+1. `git clone https://github.com/kevinmidboe/planetposen-mail`
+2. `cp .env.example .env`
+3. Update variables in `.env` file
+4. `make install`
+
+## Run
+Run api from command line with:
+```bash
+make server
+```
+
+Run as docker container using:
+
+```bash
+(sudo) docker run -d --name planetposen-mail -p 8000:8000 \
+    -e PORT=8000
+    -e SEND_GRID_API_ENDPOINT="https://api.sendgrid.com"
+    -e SEND_GRID_API_KEY="sg.nE3..."
+```
+or
+```bash
+(sudo) docker run -d --name planetposen-mail -p 8000:8000 --env-file .env planetposen-mail
+```