Created Mapbase Credits (markdown)

Mapbase-Credits.md

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+## Blixibon
+Blixibon is the original creator of this mod. Most of the work and ideas found in Mapbase are from him.
+
+
+***
+## Open-source work used in Mapbase
+### [Valve Developer Community](developer.valvesoftware.com)
+Mapbase uses many fix and improvement snippets found on the VDC.
+### [Pull requests from Valve's Source SDK 2013 GitHub repo](https://github.com/ValveSoftware/source-sdk-2013/pulls)
+A few of the pull requests have been incorporated into Mapbase.
+### [Insolence](https://github.com/95Navigator/insolence-2013)
+Most of the projected texture and shader changes were gleaned from the Insolence repo, although most of the work originally came from City 17: Episode One and G-String, as credited below.
+### [City 17: Episode One](https://github.com/KyleGospo/City-17-Episode-One-Source)
+### [G-String](https://github.com/Biohazard90/g-string_2013)
+### [MapLabs](https://github.com/Sir-Tokialot/smc-map-lab)
+### [Half-Life 2: Community Edition](https://gitlab.com/RaraCerberus/HL2CE)
+
+***
+## Contributors
+* **krassell**
+* **1upD**
+* **Rara**
+* **95Navigator**
+* **OzxyBox**
+***
+## Alpha Testing Team
+* ****
+* ****
+* ****
+* ****
+* ****