add mac setup

.gitignore

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+.vscode/**
+bin/**
+pkg/**

01_setup_dev_env_mac.md

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+# Setup GO Dev Env in Fedora
+
+* Install: Download golang pkg from https://go.dev/dl/ and install using the wizard.
+```
+> go version
+go version go1.17.6 darwin/amd64
+```
+
+* Install any code editor (I prefer VS Code).
+
+The `go` and `gofmt` binaries will become available on the system.
+
+Set `GO111MODULE` to `off`
+```
+go env -w GO111MODULE=off
+```
+
+Go code lives in a workspace which is defined by the GOPATH environment variable. A common choice among developers, and the default value of GOPATH starting from the Go 1.8 release, is to use $HOME/go:
+
+Check GOPATH set correctly:
+```
+[jay@localhost]$ go env GOPATH
+/Users/jaydihenkar/go
+```
+---
+
+Run a simple basic program from this repo.
+
+Source this project with GOPATH:
+```
+> set -x GOPATH (pwd)
+> go env GOPATH
+/Users/jaydihenkar/work/go_learning
+```
+
+Run the basic Code:
+```
+> go run src/01_basic_of_go/01_basic_of_go.go
+Enter the basic go codenum to run: 011
+Hello world....
+36
+j(0)|a(1)|y(2)|D(3)|
+3_4_5_6_7_
+15 123
+Inferred type of := 3778 is Type :: int, Size :: 8[bytes]
+Inferred type of := 2.37 + 99.42i is Type :: complex128, Size :: 16[bytes]
+```
+
+You can also run with `make`:
+```
+> make run filename=src/01_basic_of_go/01_basic_of_go.go
+go env GOPATH
+/Users/jaydihenkar/work/go_learning
+go run src/01_basic_of_go/01_basic_of_go.go
+Enter the basic go codenum to run: 011
+Hello world....
+36
+j(0)|a(1)|y(2)|D(3)|
+3_4_5_6_7_
+15 123
+Inferred type of := 3778 is Type :: int, Size :: 8[bytes]
+Inferred type of := 2.37 + 99.42i is Type :: complex128, Size :: 16[bytes]
+```

Makefile

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+GOPATH := ${HOME}/work/go_learning
+export GOPATH
+
+run:
+	go env GOPATH
+	go run ${filename}