Add message about input group

.SRCINFO

@@ -3,6 +3,7 @@ pkgbase = dcat
 	pkgver = r13.4b695f7
 	pkgrel = 1
 	url = https://github.com/Murat65536/dcat
+	install = dcat.install
 	arch = x86_64
 	license = Apache
 	makedepends = cmake

PKGBUILD

@@ -9,6 +9,7 @@ license=('Apache')
 depends=('vulkan-icd-loader' 'assimp' 'glm' 'libsixel')
 makedepends=('cmake' 'shaderc' 'git')
 options=('!debug')
+install=dcat.install
 source=("dcat::git+https://github.com/Murat65536/dcat.git")
 sha256sums=('SKIP')
 

dcat.install

@@ -0,0 +1,7 @@
+post_install() {
+  echo "To use keyboard controls, you need to be in the "input" group."
+  echo "You can add yourself to the "input" group like this:"
+  echo "sudo usermod -aG input \$USER"
+  echo "Then log out and back in."
+  echo "You can still use the program without keyboard input, it just won't be as good"
+}