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Create USER_GUIDE.md

USER_GUIDE.md

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+# What is barq?
+
+Barq is a core lightning plugin which can be used by developers to write their own routing strategies without digging 
+into the core lightning codebase. If someone wants to implement a new core lightning strategy, or play around with 
+existing ones, barq makes it simple for them to do so.
+
+
+# How to build and install barq?
+
+- clone the repository
+`git clone https://github.com/tareknaser/barq.git`
+
+- change directory to barq
+`cd barq`
+
+- build project
+`make`
+
+- once project is built, you can simply run lightning with the reference to the plugin, or use your preferred way to run a plugin in CLN
+    `<path-to-lightning>/lightningd/lightningd ... --plugin=<path-barq-repo>/target/debug/barq-plugin`
+
+# Barq commands
+
+`<path-to-lightning>/cli/lightning-cli --network=<network-name> -k <barq-command> <barq-input-parameter-1> = <value> <barq-input-parameter-2> = <value> ...`
+
+## List of barq commands
+
+- barqpay: It takes bolt11 invoice as input, and executes the lightning payment. Returns execution result as response.
+- `barqpay` where you can pass the `bolt11_invoice`, `strategy` and `use_rapid_gossip_sync` fields
+
+Example for these commands can be
+
+```lightning-cli --testnet -k barqpay bolt11_invoice=lntb10n1pndpggfsp5sj5zv0espgf2yppax9ne4e0806lwc0n80a673qgd6jwa9g8m4pkspp5ky5x2gkwclr8vzdlpt2hyhx43yhyl8cxw7adzhcdzzkze0qsqhusdq5w3jhxarfdenjqcnpwfcsxqyjw5qcqp2rzjqwyx8nu2hygyvgc02cwdtvuxe0lcxz06qt3lpsldzcdr46my5epmjf5e7uqqqpgqqqqqqqlgqqqqqqgq2q9qxpqysgqsty2zu6hqvl4zfjt40ss0zscjj64s2lpv9a6tqjg5famljcfjylnmcvgmnjeetzuews34lchfhlnmtuycf4f2ls5kzhraws5wglvm5sqr2xuh6```
+
+```clightning --testnet -k barqpay bolt11_invoice=lntb10n1pndqa76sp5hzqyqgljtd6cv2fzgnfwz050v00a69564axg83ztjczkkafqamuqpp577pgggu58vnc0y7v9kdgfs6pu44545w66wfdtdwnsmat6avuy80sdq5w3jhxarfdenjqcnpwfcsxqyjw5qcqp2rzjqgjmhs48xsve8n2e94ascxzmhrrrt8xpm5fn096ud4qn2nj8qwlkg27skgqqqvqqqcqqqp5eqqqqqqsqqc9qxpqysgqdd9twj93z6umjdau7dxdn3f6ts5qnkxy024uqr75dvfa59az8asz4mu5pk939t5u8tvxgzsfr7n0ym7qj8uzwm58c39679jgxc7n3ecq8mkune use_rapid_gossip_sync=true```
+
+```clightning --testnet -k barqpay bolt11_invoice=lntb10n1pndqa76sp5hzqyqgljtd6cv2fzgnfwz050v00a69564axg83ztjczkkafqamuqpp577pgggu58vnc0y7v9kdgfs6pu44545w66wfdtdwnsmat6avuy80sdq5w3jhxarfdenjqcnpwfcsxqyjw5qcqp2rzjqgjmhs48xsve8n2e94ascxzmhrrrt8xpm5fn096ud4qn2nj8qwlkg27skgqqqvqqqcqqqp5eqqqqqqsqqc9qxpqysgqdd9twj93z6umjdau7dxdn3f6ts5qnkxy024uqr75dvfa59az8asz4mu5pk939t5u8tvxgzsfr7n0ym7qj8uzwm58c39679jgxc7n3ecq8mkune strategy=probabilistic```