Add .github/branding with the Illustrator sources

Mark, app icon, header, social preview and the two installer bitmaps,
in Git LFS. The README there lists what each file exports to;
DEVELOPING points at the folder.

Author: ClearanceClarence

.gitattributes

@@ -66,3 +66,6 @@ SpaceSharp/Themes/Icons.xaml linguist-generated
 # Keep CI and contributor files out of "Download ZIP" and release archives of the source
 .github/ export-ignore
 .gitattributes export-ignore
+
+# Brand sources: large binaries that change rarely, kept in LFS so clones stay light
+.github/branding/*.ai filter=lfs diff=lfs merge=lfs -text

.github/branding/README.md

@@ -0,0 +1,18 @@
+# Branding
+
+The Illustrator sources for the SpaceSharp brand. Everything the app, the installer, the README and the site show is exported from here by hand; nothing is generated.
+
+| Source | Exports |
+|---|---|
+| `SpaceSharpIcon.ai` | The mark on its own: `SpaceSharp/Assets/SpaceSharp.svg`, `SpaceSharp-256.png`, `docs/icon.png`, `docs/icon-512.png`, `docs/wordmark.svg` (the mark next to the wordmark) |
+| `SpaceSharpAppIcon.ai` | The mark on the rounded Graphite tile, for Windows: `SpaceSharp/Assets/SpaceSharp.ico` (16, 20, 24, 32, 40, 48, 64, 96, 128, 256 px), `docs/app-icon-256.png`, `docs/app-icon-512.png` |
+| `SpaceSharpAppHeader.ai` | `docs/header.png` (2560 x 720; the README shows it at 800 wide) |
+| `SpaceSharpAppSocialPreview.ai` | `docs/social-preview.png` (1280 x 640, GitHub's social preview) |
+| `SpaceSharpAppInstallerBanner.ai` | `installer/banner.bmp` (493 x 58) |
+| `SpaceSharpAppInstallerLogo.ai` | `installer/logo.bmp` (493 x 312) |
+
+The two installer files must be 24-bit BMP with no alpha and no compression; the MSI dialogs read nothing else.
+
+Colors: amber `#F5B82E` (left face), `#FFD166` (top), `#C98E22` (right); graphite `#0D1117` (page and window), panel `#161B22`; interior walls `#30363D`, `#161B22`, floor `#21262D`. Type is Bricolage Grotesque (SIL OFL).
+
+The `.ai` files are stored in Git LFS (see `.gitattributes`).

.github/branding/SpaceSharpAppHeader.ai

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2122a7313af38ea73ca9d3f80adfcb6fb85a382bea420e014a97997774beb09b
+size 522231

.github/branding/SpaceSharpAppIcon.ai

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ca73205bc81975a56b20cc99fa20715849414dff1b841c4c99bba8a776dafc2f
+size 43537

.github/branding/SpaceSharpAppInstallerBanner.ai

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e32db432bda7e5d8170fac4a09de9f3941a953691ff7d1ff241a4b0afa73a28b
+size 55948

.github/branding/SpaceSharpAppInstallerLogo.ai

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d06f9145ef551b8bae0f24fce4c5a3d47b301ebbf57ce509d27c5d869a6dd43f
+size 86604

.github/branding/SpaceSharpAppSocialPreview.ai

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:490809e2422abeea1e0f3b3c1dabfba9291295ad6116549f7b6db4591951d45b
+size 568071

.github/branding/SpaceSharpIcon.ai

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f72361e186f92423b4adf3e556b691919dd886848e2d38621e4b9506addea8c1
+size 42623