add crystal plugin

plugins/crystal/crystal.plugin.zsh

@@ -0,0 +1,26 @@
+# General
+
+alias cry="crystal"
+
+# Build
+
+alias cryb="crystal build"
+alias crybr="crystal build --release"
+
+# Run
+alias cryr="crystal run"
+alias cryrr="crystal run --release"
+
+# Spec
+alias crys="crystal spec --order rando"
+alias crysu="crystal spec"
+
+# Shards
+alias sha="shards"
+alias shac="shards check"
+alias shai="shards install"
+alias shal="shards list"
+alias shao="shards outdated"
+alias shap="shards prune"
+alias shau="shards update"
+alias shav="shards version"