[jmc-graphics] RFR: 7210: Create icon for the agent (and agent plug-in)

[Marcus Hirt]

The idraw format might be a bit arbitrary, but that's what I used for this.

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Commit messages:
 - 7210: Create icon for the agent (and agent plug-in)

Changes: https://git.openjdk.java.net/jmc-graphics/pull/3/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc-graphics&pr=3&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7210
  Stats: 0 lines in 4 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc-graphics/pull/3.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc-graphics pull/3/head:pull/3

PR: https://git.openjdk.java.net/jmc-graphics/pull/3