Add try-flare backend (#108)

Author: sharkdp

staging/flare/psc-package.json

@@ -0,0 +1,17 @@
+{
+    "name": "tryflare",
+    "set": "master",
+    "source": "https://github.com/purescript/package-sets.git",
+    "depends": [
+        "sparkle",
+        "console",
+        "const",
+        "exists",
+        "free",
+        "graphs",
+        "profunctor",
+        "quickcheck",
+        "semirings",
+        "validation"
+    ]
+}