[issue #1] common provider for one or more nodes

* groups components with the same `provider` attribute (see examples)
* add the new attribute `impl` to all components (see examples)
* change microservice shape to 'octagon'
* layout README file

cmd/.gitignore

@@ -34,5 +34,3 @@ dist/**
 # Goreleaser file
 .goreleaser.yml
 
-# Custom Bash Scripts
-draft-all.sh

cmd/draft-all.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+SRC_DIR=../examples
+DPI=120
+EXE=./dist/draft_linux_amd64/draft
+
+## declare an array of files
+declare -a arr=("$SRC_DIR/client.yml" 
+                "$SRC_DIR/service.yml"
+                "$SRC_DIR/broker.yml"
+                "$SRC_DIR/gateway.yml"
+                "$SRC_DIR/queue.yml"
+                "$SRC_DIR/function.yml"
+                "$SRC_DIR/database.yml"
+                "$SRC_DIR/storage.yml"
+                "$SRC_DIR/message-bus-pattern.yml"
+                "$SRC_DIR/aws-cognito-custom-auth-flow.yml"
+                "$SRC_DIR/s3-upload-presigned-url.yml"
+                "$SRC_DIR/backend-for-frontend.yml" )
+
+## now loop through the above array
+for i in "${arr[@]}"
+do
+   # grab the filename without extension
+   filename=$(basename -- "$i")
+   # run draft...run!
+   "$EXE" "$i" | dot -Tpng -Gdpi=$DPI > "$SRC_DIR/${filename%.*}.png"
+done

cmd/test.yml

@@ -0,0 +1,41 @@
+title: Upload file to S3 using Lambda for pre-signed URL
+backgroundColor: '#ffffff'
+components:
+  -
+    kind: client
+    label: "Web App"
+    provider: Internet
+    impl: SPA
+  -
+    kind: gateway
+    provider: AWS
+    impl: "API Gateway"
+  -
+    kind: function
+    label: "Get\nPre-Signed URL"
+    provider: AWS
+    impl: "Lambda"
+  -
+    kind: storage
+    label: "*.jpg\n*.png"
+    provider: AWS
+    impl: S3
+connections:
+  -
+    origin:
+      componentId: cl1
+    targets:
+      -
+        componentId: gt1
+  -
+    origin:
+      componentId: gt1
+    targets:
+      -
+        componentId: fn1
+  -
+    origin:
+      componentId: fn1
+    targets:
+      -
+        componentId: st1