Create ServerInstructions.md

ServerInstructions.md

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+# GF server installation
+
+1. First make sure your compiler is installed with a flag server: 
+
+```bash
+cd gf-core/src/compiler/           
+runghc Setup.hs configure -f servef
+runghc Setup.hs build
+sudo runghc Setup.hs install
+```
+
+1. You can test it now by running: 
+
+```bash
+gf -server
+```
+
+It will also show the root directory (`ROOT_DIR`)