Created Build and Install (markdown)

Build-and-Install.md

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+You will need `git`, `make`, `gcc` and `libsodium`:                                                                                                                                                                                            
+                                                                                                                                                                                                                                               
+    $ sudo apt install git make gcc libsodium-dev    # debian based                                                                                                                                                                            
+    $ sudo yum install git make gcc libsodium-devel  # redhat based                                                                                                                                                                            
+                                                                                                                                                                                                                                               
+To build and install the latest release from github:                                                                                                                                                                                           
+                                                                                                                                                                                                                                               
+    $ git clone https://github.com/angt/glorytun --recursive                                                                                                                                                                                   
+    $ cd glorytun                                                                                                                                                                                                                              
+    $ sudo make install                                                                                                                                                                                                                        
+                                                                                                                                                                                                                                               
+This will install the binary in `/usr/bin` by default.                                                                                                                                                                                         
+                                                                                                                                                                                                                                               
+The more classical autotools suite is also available.