Adding place holder for open source tools

- Keep dreaming....

chip/eda/README.md

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+## CONTENTS
+* EDA specific scripts
+* Some companies don't allow sharing, in that case you probably want to have a private repo of scripts and include a symbolic link here to that repo.
+* For example "ln -s /home/synopsys ."

chip/eda/open/README.md

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+#CONTENT
+* Various open source tools
+* front end: yosys
+* analog simulator: spice
+* verilog simulator: iverilog, verilator
+* pnr: n/a
+* lvs: n/a
+* drc: n/a
+* schmatic entry: n/a
+* polygon-push: n/a
+* analog circuit generators: n/a
+* logical equivalence : n/a
+* dft compiler : n/a
+* power compiler: n/a
+* power grid analysis: n/a
+* extraction tool: n/a
+* signal integrity: n/a
+* cell characterization: n/a
+* transistor level STA: n/a
+* signoff STA: n/a
+* scan pattern generator: n/a
+* memory compiler: n/a
+* generic standard cell library: n/a
+* generic io library: n/a
+

chip/eda/open/yosys/README.md

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+## CONTENTS
+* place holder for yosys synthesis tool...