dotnet-new csproj templates (#4382)

Make csproj templates first-class in dotnet-new.

TestAssets/TestProjects/ProjectJsonWebTemplate/wwwroot/css/site.css

@@ -0,0 +1,44 @@
+body {
+    padding-top: 50px;
+    padding-bottom: 20px;
+}
+
+/* Wrapping element */
+/* Set some basic padding to keep content from hitting the edges */
+.body-content {
+    padding-left: 15px;
+    padding-right: 15px;
+}
+
+/* Set widths on the form inputs since otherwise they're 100% wide */
+input,
+select,
+textarea {
+    max-width: 280px;
+}
+
+/* Carousel */
+.carousel-caption p {
+    font-size: 20px;
+    line-height: 1.4;
+}
+
+/* buttons and links extension to use brackets: [ click me ] */
+.btn-bracketed::before {
+    display:inline-block;
+    content: "[";
+    padding-right: 0.5em;
+}
+.btn-bracketed::after {
+    display:inline-block;
+    content: "]";
+    padding-left: 0.5em;
+}
+
+/* Hide/rearrange for smaller screens */
+@media screen and (max-width: 767px) {
+  /* Hide captions */
+  .carousel-caption {
+    display: none
+  }
+}

TestAssets/TestProjects/ProjectJsonWebTemplate/wwwroot/css/site.min.css

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+body{padding-top:50px;padding-bottom:20px}.body-content{padding-left:15px;padding-right:15px}input,select,textarea{max-width:280px}.carousel-caption p{font-size:20px;line-height:1.4}.btn-bracketed::before{display:inline-block;content:"[";padding-right:.5em}.btn-bracketed::after{display:inline-block;content:"]";padding-left:.5em}@media screen and (max-width:767px){.carousel-caption{display:none}}

TestAssets/TestProjects/ProjectJsonWebTemplate/wwwroot/js/site.js

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+// Write your Javascript code.