Create language bindings request form

Author: moritztim

.github/ISSUE_TEMPLATE/language_bindings_request.pkl

@@ -0,0 +1,69 @@
+name = "Language Bindings Request"
+description = "Request for Pkl bindings for a programming language."
+title = "[Bindings Request]: "
+labels {
+  "bindings"
+  "enhancement"
+}
+body {
+  new {
+    type = "markdown"
+    attributes {
+      value = """
+        ## Language Bindings Request
+        Thank you for your interest in expanding the compatibility of Pkl!
+        Before you fill out this request form, please do the following:
+          -  Check the [documentation](https://pkl-lang.org/main/current/language-bindings.html) to confirm that this language isn't already supported.
+          -  Search for [existing issues and pull requests](https://github.com/apple/pkl/issues?q="label%3Alanguage-bindings+) to ensure this bindings request has not already been submitted."
+        """
+    }
+  }
+  new {
+    type = "checkboxes"
+    id = "readiness"
+    attributes {
+      label = "Confirmation"
+      description = "Please confirm the following items before submitting a new request."
+      options {
+        new {
+          label = "I have checked the documentation to confirm this language isn't already supported."
+          required = true
+        }
+        new {
+          label = "I have searched for existing issues and pull requests to ensure this bindings request has not already been submitted."
+          required = true
+        }
+      }
+    }
+  }
+  new {
+    type = "input"
+    id = "language-name"
+    attributes {
+      label = "Language Name"
+      description = "What is the name of the programming language for which you're requesting bindings?"
+    }
+    validations {
+      required = true
+    }
+  }
+  new {
+    type = "textarea"
+    id = "pitch"
+    attributes {
+      label = "Pitch"
+      description = "Why should we add support for this language?"
+    }
+  }
+  new {
+    type = "textarea"
+    id = "additional-info"
+    attributes {
+      label = "Additional Information (Optional)"
+      description = "Any other information you'd like to add"
+    }
+    validations {
+      required = false
+    }
+  }
+}