Updated docs on configuration and required env vars. (#285)

* Updated docs on configuration and required env vars.

* minor

examples/inputs/.gitignore

@@ -0,0 +1,6 @@
+vendor/
+/go
+/app
+/__uberscript__
+
+func.yaml

examples/inputs/README.md

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+# Tutorial 1: Go Function w/ Input (3 minutes)
+
+Example for putting required vars into the func.yaml file.
+
+Try running the following:
+
+```sh
+fn run
+# > ERROR: required env var SECRET_1 not found, please set either set it in your environment or pass in `-e SECRET_1=X` flag.
+SECRET_1=YOOO fn run
+# > info: optional env var SECRET_2 not found.
+# > {"SECRET_1":"YOOO","SECRET_2":"","message":"Hello World"}
+SECRET_1=YOOO SECRET_2=DAWG fn run
+# > {"SECRET_1":"YOOO","SECRET_2":"DAWG","message":"Hello World"}
+```

examples/inputs/func.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+type Person struct {
+	Name string
+}
+
+func main() {
+	p := &Person{Name: "World"}
+	json.NewDecoder(os.Stdin).Decode(p)
+	mapD := map[string]string{"message": fmt.Sprintf("Hello %s", p.Name)}
+	mapD["SECRET_1"] = os.Getenv("SECRET_1")
+	mapD["SECRET_2"] = os.Getenv("SECRET_2")
+	mapB, _ := json.Marshal(mapD)
+	fmt.Println(string(mapB))
+}

examples/inputs/sample.payload.json

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+{
+    "name": "Johnny"
+}

examples/inputs/test.json

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+{
+    "tests": [
+        {
+            "input": {
+                "body": {
+                    "name": "Johnny"
+                }
+            },
+            "output": {
+                "body": {
+                    "message": "Hello Johnny"
+                }
+            }
+        },
+        {
+            "input": {
+                "body": ""
+            },
+            "output": {
+                "body": {
+                    "message": "Hello World"
+                }
+            }
+        }
+    ]
+}