Associate post with crop from crop show page

Co-authored-by: CloCkWeRX <365751+CloCkWeRX@users.noreply.github.com>

app/controllers/posts_controller.rb

@@ -21,6 +21,10 @@ class PostsController < ApplicationController
   def new
     @post = Post.new
     @forum = Forum.find_by(id: params[:forum_id])
+    if params[:crop_id]
+      @crop = Crop.friendly.find(params[:crop_id])
+      @post.body = "[#{@crop.name}](crop)"
+    end
     respond_with(@post)
   end