Initiate base files for project starting

Set base files:
- [x] `README.md`
- [x] `LICENCE`
- [x] `TEMPLATE_HEADER.txt`
- [ ] `SECURITY.md`
- [ ] `CONTRIBUTING.md`
- [x] `CODE_OF_CONDUCT.md`
- [x] `.gitignore`

Logo:
- [x] Set logo files and related licence
