Adds codeblock for random costume change

This code block seems to be missing from the resource, which can throw people - especially as it hasnt been covered in previous resources

Have also added this to the next codeblock example
Fixed typo - constume to costume
Merge pull request #174 from stevieflow/patch-2

Adds codeblock for random costume change
4 new projects added // project reordering // removing of numbers from folder & filenames
Fix case issues
Balloons project -- md contained incorrect filenames which caused 2 broken image links
Various text improvements
Fix typos in ChatBot project
Merge pull request #178 from andylolz/typos

Fix typos in ChatBot project
Various project fixes/typos
Moved 'additional projects' manifest down, to make way for HTML Term 2
Added warning to manifest
Fixing 'warning' text
Switch to scratch 2 notation in ChatBot
Merge pull request #179 from andylolz/scratch2

Switch to scratch 2 notation in ChatBot
Added scratch preview to chatbot project
Merge branch 'master' of https://github.com/CodeClub/scratch-curriculum

Conflicts:
	en-GB/Term 1/ChatBot/ChatBot.md
Merging
Embedded Scratch projects added for projects 1-3
Using newer {.block...} styling