Add README to font folder

3270/README.rst

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+3270
+====
+
+:Font creator: Ricardo Bánffy
+:Version: 1.2.14
+:Source: https://github.com/rbanffy/3270font
+:License: BSD/CCAS 3.0
+:Patched by: N/A
+
+The 3270 font is derived from the x3270 font, which, in turn, was
+translated from the one in Georgia Tech's 3270tool, which was itself
+hand-copied from a 3270-series terminal.
+
+Both the final font Truetype/OpenType files and the design files used
+to produce the font family are distributed under an open licence and
+you are expressly encouraged to experiment, modify, share and improve.