Creating ADOPTERS.md as well as ADOPTERS ISSUE Type for future adopters showcase

[spawar-apex]

Description

Add an ADOPTERS file that lists people who are using OWASP Dependency Track in interesting ways.

Addressed Issue

Created a ADOPTERS.md file as well as Adopt Dependency Track issue template to submit to add organizations to the ADOPTERS list.

Additional Details

Checklist

• [x] I have read and understand the contributing guidelines
• [ ] This PR fixes a defect, and I have provided tests to verify that the fix is effective
• [ ] This PR implements an enhancement, and I have provided tests to verify that it works as intended
• [ ] This PR introduces changes to the database model, and I have added corresponding update logic
• [ ] This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅ (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (b4ca2f189a542aa1978287f2147a7ffeab86dfd3) | 21708 | 16478 | 75.91% | | | Head commit (31edb6d6d6dfe092123890058aeeb743a824750c) | 21708 (+0) | 16478 (+0) | 75.91% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#3803) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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