feat(build): Flesh out rockspec for installation as library

sile-dev-1.rockspec

@@ -1,12 +1,27 @@
+rockspec_format = "3.0"
 package = "sile"
-description = {
-  summary = "Simon’s Improved Layout Engine",
-  license = "MIT"
-}
 version = "dev-1"
+
 source = {
-  url = "..."
+  url = "git+https://github.com/sile-typesetter/sile.git",
+  branch = "master"
+}
+
+description = {
+  summary = "Simon’s Improved Layout Engine",
+  detailed = [[
+    SILE is a typesetting system; its job is to produce beautiful printed
+    documents. Conceptually, SILE is similar to TeX—from which it borrows
+    some concepts and even syntax and algorithms—but the similarities end
+    there. Rather than being a derivative of the TeX family SILE is a new
+    typesetting and layout engine written from the ground up using modern
+    technologies and borrowing some ideas from graphical systems such as
+    InDesign.]],
+  license = "MIT",
+  homepage = "https://github.com/sile-typesetter/sile",
+  issues_url = "https://github.com/sile-typesetter/sile/issues"
 }
+
 dependencies = {
   "lua >= 5.1",
   "bit32", -- only required on Lua < 5.2, versions vary between Rock and VM provided
@@ -31,7 +46,16 @@ dependencies = {
   "stdlib == 41.2.2-1",
   "vstruct == 2.1.1-1"
 }
+
+test_dependencies = {
+   "busted",
+   "ProFi"
+}
+
+test = {
+  type = "busted",
+}
+
 build = {
-  type = "builtin",
-  modules = {}
+  type = "none",
 }