Add our AWS EC2 instance example in Go (pulumi#512)

This translates our existing AWS EC2 instance examples that we already
have in JavaScript and Python to Go.

Author: joeduffy

aws-go-webserver/Pulumi.yaml

@@ -0,0 +1,8 @@
+name: go-webserver
+runtime: go
+description: Basic example of an AWS web server accessible over HTTP
+template:
+  config:
+    aws:region:
+      description: The AWS region to deploy into
+      default: us-east-1

aws-go-webserver/README.md

@@ -0,0 +1,69 @@
+[![Deploy](https://get.pulumi.com/new/button.svg)](https://app.pulumi.com/new)
+
+# Web Server Using Amazon EC2 (in Go)
+
+This example deploys a simple AWS EC2 virtual machine running a Python web server. It uses Go as its infrastructure as
+code language.
+
+## Deploying the App
+
+To deploy your infrastructure, follow the below steps.
+
+### Prerequisites
+
+1. [Install Go](https://golang.org/doc/install)
+2. [Install Pulumi](https://www.pulumi.com/docs/get-started/install/)
+3. [Configure AWS Credentials](https://www.pulumi.com/docs/intro/cloud-providers/aws/setup/)
+
+### Steps
+
+After cloning this repo, from this working directory, run these commands:
+
+1. Go is a compiled language, so you must first compile it:
+
+    ```bash
+    $ go build -o go-webserver
+    ```
+
+2. Next, create a new Pulumi stack, which is an isolated deployment target for this example:
+
+    ```bash
+    $ pulumi stack init
+    ```
+
+3. Set the required configuration variables for this program:
+
+    ```bash
+    $ pulumi config set aws:region us-east-1
+    ```
+
+4. Stand up the VM, which will also boot up your Python web server on port 80:
+
+    ```bash
+    $ pulumi up
+    ```
+
+5. After a couple minutes, your VM will be ready, and two stack outputs are printed:
+
+    ```bash
+    $ pulumi stack output
+    Current stack outputs (2):
+    OUTPUT          VALUE
+    publicIp        53.40.227.82
+    ```
+
+6. Thanks to the security group making port 80 accessible to the 0.0.0.0/0 CIDR block, we can curl it:
+
+    ```bash
+    $ curl $(pulumi stack output publicIp)
+    Hello, World!
+    ```
+
+7. From there, feel free to experiment. Simply making edits and running `pulumi up` will incrementally update your VM.
+
+8. Afterwards, destroy your stack and remove it:
+
+    ```bash
+    $ pulumi destroy --yes
+    $ pulumi stack rm --yes
+    ```

aws-go-webserver/go.mod

@@ -0,0 +1,8 @@
+module github.com/pulumi/examples/aws-go-webserver
+
+go 1.13
+
+require (
+	github.com/pulumi/pulumi v1.8.1
+	github.com/pulumi/pulumi-aws v1.17.0
+)